https://bz.apache.org/bugzilla/show_bug.cgi?id=65731

            Bug ID: 65731
           Summary: Empty response body after MaxRequestsPerChild reached
                    for HTTP/2.0
           Product: Apache httpd-2
           Version: 2.4.41
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: mod_http2
          Assignee: bugs@httpd.apache.org
          Reporter: anton...@nine.ch
  Target Milestone: ---

When requesting a simple image file with HTTP2 every time MaxRequestsPerChild
is reached, an empty response is sent to the client. This is even reproducible.

Server Version: Apache/2.4.41 (Ubuntu) OpenSSL/1.1.1f
Server MPM: event
OS: Ubuntu 20.04

Server Version: Apache/2.4.29 (Ubuntu) OpenSSL/1.1.1
Server MPM: worker
OS: Ubuntu 18.04

Same issue exists with mpm_event and mpm_worker.

My configuration:

<IfModule mpm_event_module>
    StartServers 8
    MinSpareThreads 4
    MaxSpareThreads 12
    ThreadLimit 64
    ThreadsPerChild 16
    MaxRequestsPerChild 100
    ServerLimit 64
    MaxClients 64
</IfModule>

mod_http2 no custom configuration in use.

Test command:
for i in {1..2000}; do if [[ $(curl -o /dev/null -s -k --http2
https://example.net/2101583.jpg?test=$i -w '%{size_download}') == 0 ]]; then
break; fi; done

Access log output:
8.8.8.8 - - [08/Dec/2021:18:20:32 +0100] "GET /2101583.jpg?fakeVar=33 HTTP/2.0"
200 17115 "-" "curl/7.68.0"
8.8.8.8 - - [08/Dec/2021:18:20:33 +0100] "GET /2101583.jpg?fakeVar=34 HTTP/2.0"
200 17115 "-" "curl/7.68.0"
8.8.8.8 - - [08/Dec/2021:18:20:33 +0100] "GET /2101583.jpg?fakeVar=35 HTTP/2.0"
200 0 "-" "curl/7.68.0"
8.8.8.8 - - [08/Dec/2021:18:20:33 +0100] "GET /2101583.jpg?fakeVar=36 HTTP/2.0"
200 17115 "-" "curl/7.68.0"
8.8.8.8 - - [08/Dec/2021:18:20:33 +0100] "GET /2101583.jpg?fakeVar=37 HTTP/2.0"
200 17115 "-" "curl/7.68.0"
8.8.8.8 - - [08/Dec/2021:18:20:33 +0100] "GET /2101583.jpg?fakeVar=38 HTTP/2.0"
200 17115 "-" "curl/7.68.0"
8.8.8.8 - - [08/Dec/2021:18:20:33 +0100] "GET /2101583.jpg?fakeVar=39 HTTP/2.0"
200 17115 "-" "curl/7.68.0"
...
8.8.8.8 - - [08/Dec/2021:18:20:37 +0100] "GET /2101583.jpg?fakeVar=135
HTTP/2.0" 200 0 "-" "curl/7.68.0"
...
8.8.8.8 - - [08/Dec/2021:18:20:42 +0100] "GET /2101583.jpg?fakeVar=235
HTTP/2.0" 200 0 "-" "curl/7.68.0"
...
8.8.8.8 - - [08/Dec/2021:18:20:47 +0100] "GET /2101583.jpg?fakeVar=335
HTTP/2.0" 200 0 "-" "curl/7.68.0"

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