Some feeds are not parsed correctly due to wrong handling of HTTP trailer headers such as Server-Timing.

Example of feed:
https://www.caranddriver.com/rss/all.xml
(Note that the bug may or may not exhibit itself depending on the cURL and PHP versions)

Downstream discussion:

• [Feed problem] "Invalid document end" for caranddriver.com FreshRSS/FreshRSS#7981

SimplePie tries to XML parse something like </rss>server-timing: rtt; dur=6.131, retrans; dur=0, trailer-timestamp; dur=1758222994925 which obviously fails.

In the case of normal HTTP transfer (not chunked), we need to use content-length to know where the body stops, but content-length is wrong if any compression was used.
So I believe we should let cURL perform the separation of HTTP headers and body instead of using the SimplePie parser.

I have a downstream fix for FreshRSS. Let me know if you are interested in such an approach for an upstream PR:

• Fix SimplePie support of HTTP trailer headers FreshRSS/FreshRSS#7983