https://bz.apache.org/bugzilla/show_bug.cgi?id=68827
Bug ID: 68827
Summary: FCGI must support flushing
Product: Apache httpd-2
Version: 2.4.57
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P2
Component: mod_proxy_fcgi
Assignee: bugs@httpd.apache.org
Reporter: voris...@fel.cvut.cz
Target Milestone: ---
Currently, when PHP (or any other FCGI server) is hosted using Apache /w
mod_proxy_fcgi, it is impossible to flush the data to the client.
In https://github.com/atk4/ui/issues/2178#issuecomment-2017720663 I have
described my testing results of current Apache, nginx and internal PHP
webserver behaviour with different settings.
This issue can be workaround, when the application protocol allows some extra
content to be inserted, by sending at least 4096 bytes. With mod_deflate
enabled, about at least 50KB of incompressible bytes are needed. When no extra
content can be inserted, no workaround is possible.
This is very far from ideal and it complicates the deployment of apps that
require streamed data support.
In nginx, the buffering can be disabled using `x-accel-buffering: no` header
[1]. This is a feature request to honor such server header by Apache webserver
as well, ie. when such header is received by APache by FCGI server, disable
buffering like when the proxy would be configured using `flushpackets: on` [2].
[1] docs https://nginx.org/en/docs/http/ngx_http_proxy_module.html
[2] docs https://httpd.apache.org/docs/2.4/mod/mod_proxy.html
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