Nginx uses a variable "$proxy_internal_body_length" for the "Content-Length" header in http proxy module, which is cacheable and shared between the main request and all subrequests by default. Although ctx->internal_body_length is calculated for each request/subrequest, the string format is cached after the first generation, and this may be wrong for other subrequests.
The following simple config can reproduce the problem, where xxxxx is a
place that can receive post data. curl --data-binary "xxxxxxxxxxxxxxx"
localhost/test.html will cause the client hang.
location = /test.html {
add_after_body /vpost;
proxy_pass http://xxxxx;
}
location /vpost {
proxy_set_body "in vpost";
proxy_pass http://xxxxx;
}
proxy_internal_body_length.patch
Description: Binary data
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