Dave Syer opened SPR-12500 and commented

If a proxy strips a prefix from the path before forwarding it might add an X-Forwarded-Prefix header. It's not as common as X-Forwarded-Host (but neither is a standard, just a convention). If the backend has to send a Location header back (for instance) it needs to re-add the prefix to the URL path. It's very similar to what ServletUriComponentsBuilder is already doing, but with an extra path element in the URL.

Affects: 4.1.2

Issue Links:

• DATAREST-620 Hateoas Link generation behind Zuul proxy
• ServletUriComponentsBuilder should replace context path when X-Forwarded-Prefix is present [SPR-16650] #21191 ServletUriComponentsBuilder should replace context path when X-Forwarded-Prefix is present
• ForwardedHeaderFilter could support X-Forwarded-Prefix as well [SPR-14270] #18842 ForwardedHeaderFilter could support X-Forwarded-Prefix as well