Apache PHP-FPM "Software caused connection abort"

Question

Just as a note to self, and might be helpful to others...
My Apache error_log contained the error:

Software caused connection abort
Error dispatching request to : (reading input brigade)

For example:
[Mon Sep 07 12:56:24.267462 2020] [proxy_fcgi:error] [pid 13938:tid 140607124641236] (103)Software caused connection abort: [client 1.1.1.1:9060] AH01075: Error dispatching request to : (reading input brigade), referer: https://example.com/path/

And the Apache access_log contained:
1.1.1.1 - - [2020-09-07 12:56:17] [-] "POST /path/ HTTP/2.0" 400 308 "https://example.com/path/" "Mozilla/5.0 ..."

Note the HTTP status of 400 Bad Request, and it happened 7 seconds later.
Also, where it's being processed in PHP, I use register_shutdown_function to create my own log file, which details every request - including the UserID, the http_response_code() (in this case 200), how long the request took to process (0.031 seconds), and when it happened (the later time, 12:56:17).
This is with Apache/2.4.29 and PHP-FPM 7.2

Craig Francis · Accepted Answer

This happened when the user was part way uploading a file, and canceled it.
The partial file is still passed to PHP-FPM, and the PHP script still runs.
PHP sets $_FILES['name']['error'] === 3, to indicate the file has been partially uploaded; so, in my script, I returned a HTML page with an error message about the incomplete file (hence the 200 response in my logs).
I assume the Software caused connection abort and Error dispatching request to : (reading input brigade) is describing how this HTML is not being returned to the client/browser.

Apache PHP-FPM "Software caused connection abort"

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