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Kobo Proxy causes sync errors when the upstream proxy fails #216

Closed
Bug
#217
Closed
Kobo Proxy causes sync errors when the upstream proxy fails#216
Bug
#217
@imnotjames

Description

@imnotjames
imnotjames
opened on Mar 26, 2026

What Went Wrong?

Whenever Kobo servers error out the kobo sync fails to process with an HTTP 500.

This is because Kobo servers respond with HTML when they have an error code in most cases.

An example scenario is when a user attempts to access the kobo sync APIs without an authorization header. The authorization header is expected by Kobo's upstream servers and they fail with an HTTP 400 response. This HTML error message attempts to get parsed as JSON, fails with an exception, and goes uncaught leading to an HTTP 500.

In most cases this is fine - the request is either one or the other. However, in the sync or init routes we try to combine these together. In the init route we skip the proxy request in case of failure

How Can We Reproduce This?

  1. Set up kobo sync
  2. Navigate to /api/kobo/{token}/v1/library/sync
  3. Observe HTTP 5xx

What Should Have Happened?

Either handle the error more gracefully (eg, don't try to parse JSON from errors) or ignore exceptions thrown by the kobo proxy when trying to combine it with the sync (this is what Komga does).

Screenshots or Error Messages (Optional)

Trace 
tools.jackson.core.exc.StreamReadException: Unexpected character ('<' (code 60)): expected a valid value (JSON String, Number, Array, Object or token 'null', 'true' or 'false')
 at [Source: REDACTED (`StreamReadFeature.INCLUDE_SOURCE_IN_LOCATION` disabled); byte offset: #UNKNOWN]
	at tools.jackson.core.JsonParser._constructReadException(JsonParser.java:1800) ~[jackson-core-3.0.4.jar:3.0.4]
	at tools.jackson.core.base.ParserMinimalBase._reportUnexpectedChar(ParserMinimalBase.java:1049) ~[jackson-core-3.0.4.jar:3.0.4]
	at tools.jackson.core.json.ReaderBasedJsonParser._handleOddValue(ReaderBasedJsonParser.java:2061) ~[jackson-core-3.0.4.jar:3.0.4]
	at tools.jackson.core.json.ReaderBasedJsonParser.nextToken(ReaderBasedJsonParser.java:791) ~[jackson-core-3.0.4.jar:3.0.4]
	at tools.jackson.databind.ObjectMapper._readTreeAndClose(ObjectMapper.java:2637) ~[jackson-databind-3.0.4.jar:3.0.4]
	at tools.jackson.databind.ObjectMapper.readTree(ObjectMapper.java:1155) ~[jackson-databind-3.0.4.jar:3.0.4]
	at org.booklore.service.kobo.KoboServerProxy.executeProxyRequest(KoboServerProxy.java:126) ~[main/:na]
	at org.booklore.service.kobo.KoboServerProxy.proxyCurrentRequest(KoboServerProxy.java:68) ~[main/:na]
	at org.booklore.service.kobo.KoboLibrarySyncService.syncLibrary(KoboLibrarySyncService.java:113) ~[main/:na]
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[na:na]
	at java.base/java.lang.reflect.Method.invoke(Method.java:565) ~[na:na]
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:359) ~[spring-aop-7.0.5.jar:7.0.5]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) ~[spring-aop-7.0.5.jar:7.0.5]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:158) ~[spring-aop-7.0.5.jar:7.0.5]
	at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:133) ~[spring-tx-7.0.5.jar:7.0.5]
	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:371) ~[spring-tx-7.0.5.jar:7.0.5]
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:130) ~[spring-tx-7.0.5.jar:7.0.5]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-7.0.5.jar:7.0.5]
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:719) ~[spring-aop-7.0.5.jar:7.0.5]
	at org.booklore.service.kobo.KoboLibrarySyncService$$SpringCGLIB$$0.syncLibrary(<generated>) ~[main/:na]
	at org.booklore.controller.KoboController.syncLibrary(KoboController.java:67) ~[main/:na]
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[na:na]
	at java.base/java.lang.reflect.Method.invoke(Method.java:565) ~[na:na]
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:252) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:184) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117) ~[spring-webmvc-7.0.5.jar:7.0.5]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:934) ~[spring-webmvc-7.0.5.jar:7.0.5]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:853) ~[spring-webmvc-7.0.5.jar:7.0.5]
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:86) ~[spring-webmvc-7.0.5.jar:7.0.5]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963) ~[spring-webmvc-7.0.5.jar:7.0.5]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:866) ~[spring-webmvc-7.0.5.jar:7.0.5]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1000) ~[spring-webmvc-7.0.5.jar:7.0.5]
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:892) ~[spring-webmvc-7.0.5.jar:7.0.5]
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:622) ~[tomcat-embed-core-11.0.18.jar:6.1]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:874) ~[spring-webmvc-7.0.5.jar:7.0.5]
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:710) ~[tomcat-embed-core-11.0.18.jar:6.1]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:128) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-11.0.18.jar:11.0.18]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.booklore.config.security.filter.KoreaderAuthFilter.doFilterInternal(KoreaderAuthFilter.java:33) ~[main/:na]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:110) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.booklore.config.security.filter.JwtAuthenticationFilter.doFilterInternal(JwtAuthenticationFilter.java:48) ~[main/:na]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.booklore.config.security.filter.ImageCachingFilter.doFilterInternal(ImageCachingFilter.java:25) ~[main/:na]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.security.web.FilterChainProxy.lambda$doFilterInternal$3(FilterChainProxy.java:235) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$FilterObservation$SimpleFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:493) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:354) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator.lambda$wrapSecured$0(ObservationFilterChainDecorator.java:86) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:132) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.access.intercept.AuthorizationFilter.doFilter(AuthorizationFilter.java:101) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:126) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:120) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:132) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:86) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:100) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:181) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.booklore.config.security.filter.KoboAuthFilter.doFilterInternal(KoboAuthFilter.java:83) ~[main/:na]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:96) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:82) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:69) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:62) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.session.DisableEncodeUrlFilter.doFilterInternal(DisableEncodeUrlFilter.java:42) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$0(ObservationFilterChainDecorator.java:337) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:228) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:237) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:195) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.web.filter.ServletRequestPathFilter.doFilter(ServletRequestPathFilter.java:52) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.security.config.annotation.web.configuration.WebSecurityConfiguration$CompositeFilterChainProxy.doFilter(WebSecurityConfiguration.java:317) ~[spring-security-config-7.0.3.jar:7.0.3]
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:355) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:272) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.springframework.web.filter.ServerHttpObservationFilter.doFilterInternal(ServerHttpObservationFilter.java:110) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:199) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:165) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:77) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:492) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:113) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:83) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:72) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:685) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:341) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:397) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:903) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1779) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at java.base/java.lang.VirtualThread.run(VirtualThread.java:456) ~[na:na]

2026-03-26T04:11:34.923Z ERROR 166 --- [booklore-api] [mcat-handler-81] o.b.exception.GlobalExceptionHandler     : Unhandled exception: 500 INTERNAL_SERVER_ERROR "Failed to proxy request to Kobo"

org.springframework.web.server.ResponseStatusException: 500 INTERNAL_SERVER_ERROR "Failed to proxy request to Kobo"
	at org.booklore.service.kobo.KoboServerProxy.executeProxyRequest(KoboServerProxy.java:154) ~[main/:na]
	at org.booklore.service.kobo.KoboServerProxy.proxyCurrentRequest(KoboServerProxy.java:68) ~[main/:na]
	at org.booklore.service.kobo.KoboLibrarySyncService.syncLibrary(KoboLibrarySyncService.java:113) ~[main/:na]
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[na:na]
	at java.base/java.lang.reflect.Method.invoke(Method.java:565) ~[na:na]
	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:359) ~[spring-aop-7.0.5.jar:7.0.5]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) ~[spring-aop-7.0.5.jar:7.0.5]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:158) ~[spring-aop-7.0.5.jar:7.0.5]
	at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:133) ~[spring-tx-7.0.5.jar:7.0.5]
	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:371) ~[spring-tx-7.0.5.jar:7.0.5]
	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:130) ~[spring-tx-7.0.5.jar:7.0.5]
	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-7.0.5.jar:7.0.5]
	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:719) ~[spring-aop-7.0.5.jar:7.0.5]
	at org.booklore.service.kobo.KoboLibrarySyncService$$SpringCGLIB$$0.syncLibrary(<generated>) ~[main/:na]
	at org.booklore.controller.KoboController.syncLibrary(KoboController.java:67) ~[main/:na]
	at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104) ~[na:na]
	at java.base/java.lang.reflect.Method.invoke(Method.java:565) ~[na:na]
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:252) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:184) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117) ~[spring-webmvc-7.0.5.jar:7.0.5]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:934) ~[spring-webmvc-7.0.5.jar:7.0.5]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:853) ~[spring-webmvc-7.0.5.jar:7.0.5]
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:86) ~[spring-webmvc-7.0.5.jar:7.0.5]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963) ~[spring-webmvc-7.0.5.jar:7.0.5]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:866) ~[spring-webmvc-7.0.5.jar:7.0.5]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1000) ~[spring-webmvc-7.0.5.jar:7.0.5]
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:892) ~[spring-webmvc-7.0.5.jar:7.0.5]
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:622) ~[tomcat-embed-core-11.0.18.jar:6.1]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:874) ~[spring-webmvc-7.0.5.jar:7.0.5]
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:710) ~[tomcat-embed-core-11.0.18.jar:6.1]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:128) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-11.0.18.jar:11.0.18]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.booklore.config.security.filter.KoreaderAuthFilter.doFilterInternal(KoreaderAuthFilter.java:33) ~[main/:na]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:110) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.booklore.config.security.filter.JwtAuthenticationFilter.doFilterInternal(JwtAuthenticationFilter.java:48) ~[main/:na]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.booklore.config.security.filter.ImageCachingFilter.doFilterInternal(ImageCachingFilter.java:25) ~[main/:na]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:101) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:108) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.security.web.FilterChainProxy.lambda$doFilterInternal$3(FilterChainProxy.java:235) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$FilterObservation$SimpleFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:493) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$1(ObservationFilterChainDecorator.java:354) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator.lambda$wrapSecured$0(ObservationFilterChainDecorator.java:86) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:132) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.access.intercept.AuthorizationFilter.doFilter(AuthorizationFilter.java:101) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:126) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:120) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:132) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:86) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:100) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:181) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.booklore.config.security.filter.KoboAuthFilter.doFilterInternal(KoboAuthFilter.java:83) ~[main/:na]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:96) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:82) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.context.SecurityContextHolderFilter.doFilter(SecurityContextHolderFilter.java:69) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:62) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:231) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.session.DisableEncodeUrlFilter.doFilterInternal(DisableEncodeUrlFilter.java:42) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.wrapFilter(ObservationFilterChainDecorator.java:244) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$AroundFilterObservation$SimpleAroundFilterObservation.lambda$wrap$0(ObservationFilterChainDecorator.java:337) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$ObservationFilter.doFilter(ObservationFilterChainDecorator.java:228) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.ObservationFilterChainDecorator$VirtualFilterChain.doFilter(ObservationFilterChainDecorator.java:141) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:237) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:195) ~[spring-security-web-7.0.3.jar:7.0.3]
	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.web.filter.ServletRequestPathFilter.doFilter(ServletRequestPathFilter.java:52) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.web.filter.CompositeFilter$VirtualFilterChain.doFilter(CompositeFilter.java:113) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.web.filter.CompositeFilter.doFilter(CompositeFilter.java:74) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.security.config.annotation.web.configuration.WebSecurityConfiguration$CompositeFilterChainProxy.doFilter(WebSecurityConfiguration.java:317) ~[spring-security-config-7.0.3.jar:7.0.3]
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:355) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:272) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.springframework.web.filter.ServerHttpObservationFilter.doFilterInternal(ServerHttpObservationFilter.java:110) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:199) ~[spring-web-7.0.5.jar:7.0.5]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-7.0.5.jar:7.0.5]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:165) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:77) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:492) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:113) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:83) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:72) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:685) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:341) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:397) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:903) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1779) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) ~[tomcat-embed-core-11.0.18.jar:11.0.18]
	at java.base/java.lang.VirtualThread.run(VirtualThread.java:456) ~[na:na]
Caused by: tools.jackson.core.exc.StreamReadException: Unexpected character ('<' (code 60)): expected a valid value (JSON String, Number, Array, Object or token 'null', 'true' or 'false')
 at [Source: REDACTED (`StreamReadFeature.INCLUDE_SOURCE_IN_LOCATION` disabled); byte offset: #UNKNOWN]
	at tools.jackson.core.JsonParser._constructReadException(JsonParser.java:1800) ~[jackson-core-3.0.4.jar:3.0.4]
	at tools.jackson.core.base.ParserMinimalBase._reportUnexpectedChar(ParserMinimalBase.java:1049) ~[jackson-core-3.0.4.jar:3.0.4]
	at tools.jackson.core.json.ReaderBasedJsonParser._handleOddValue(ReaderBasedJsonParser.java:2061) ~[jackson-core-3.0.4.jar:3.0.4]
	at tools.jackson.core.json.ReaderBasedJsonParser.nextToken(ReaderBasedJsonParser.java:791) ~[jackson-core-3.0.4.jar:3.0.4]
	at tools.jackson.databind.ObjectMapper._readTreeAndClose(ObjectMapper.java:2637) ~[jackson-databind-3.0.4.jar:3.0.4]
	at tools.jackson.databind.ObjectMapper.readTree(ObjectMapper.java:1155) ~[jackson-databind-3.0.4.jar:3.0.4]
	at org.booklore.service.kobo.KoboServerProxy.executeProxyRequest(KoboServerProxy.java:126) ~[main/:na]
	... 151 common frames omitted

Any Ideas on How to Fix This? (Optional)

  1. Don't try to parse JSON from errors in the kobo proxy.
  2. Handle errors in the sync route by skipping the proxy in cases of failure.

Your Setup

Grimmory 2.3.0

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  • I've searched existing issues and confirmed this bug hasn't been reported yet

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