Issue with exporting using Firefox or Safari (or PHP8.1.4 issue) - file is not saved because of issue with reading source file

[Draghmar]

Describe the bug

Not sure if it's FF or phpMyAdmin or something completely different but recently whenever I want to export anything (doesn't matter if it's sql or csv and if it's compressed or not) I'm getting weird message about FF not being able to read source file, which results in file not being downloaded/saved. The file placeholder is created at the destination but it's removed right after hitting confirmation on the window:

The message in the window can be translated as:

Downloading ...
File ... can not be saved because source file is not readable.
You should try later or contact server administrator.

I also tried that on older FF version (98dev) and there was no message but the file was empty.
Using View output as file works properly.

Also affects Safari: hestiacp/hestiacp#2529 (comment)

To Reproduce

Steps to reproduce the behavior:

1. Go to any table.
2. Click on Export.
3. Choose to save as file.
4. See error.

Server configuration

• Operating system: ArchLinux
• Web server: Apache/2.4.52
• Database version: doesn't matter, tried this on few
• PHP version: 8.1.4
• phpMyAdmin version: 5.1.3

Client configuration

• Browser: Firefox 99.0b5
• Operating system: Win10

[kamil-tekiela]

Do you encounter this issue in Firefox Safe mode as well? It sounds more like a client issue. Have you tried reinstalling and resetting all Firefox settings?
Would you be able to tell us what you see in the Network tab? Press F12 and monitor the Network tab when trying the export. Take some screenshots of the response headers if possible.

[Draghmar]

I've made additional tests from different server with the same phpMyAdmin version but it had PHP 8.1.3. It worked there. But after updating to 8.1.4 the same issue showed up. After seeing that I also checked this on Chrome and there's the same result, which is empty file because of the "network issue". That would suggest it's related to PHP 8.1.4 somehow...

As for the headers, this is when trying to export as sql:

HTTP/2 200 OK
x-powered-by: PHP/8.1.4
x-ob_mode: 1
content-encoding: gzip
vary: Accept-Encoding
expires: Fri, 18 Mar 2022 14:44:04 +0000
cache-control: no-store, no-cache, must-revalidate,  pre-check=0, post-check=0, max-age=0
pragma: no-cache
content-description: File Transfer
content-disposition: attachment; filename="REMOVED.sql"
content-transfer-encoding: binary
set-cookie: REMOVED; path=/; secure; HttpOnly; SameSite=Strict
set-cookie: REMOVED path=/; secure; HttpOnly; SameSite=Strict
last-modified: Fri, 18 Mar 2022 14:44:04 GMT
content-type: text/x-sql;charset=utf-8
date: Fri, 18 Mar 2022 14:44:03 GMT
server: Apache/2.4.52 (Unix) OpenSSL/1.1.1m
X-Firefox-Spdy: h2

And this one is for csv:

HTTP/2 200 OK
x-powered-by: PHP/8.1.4
x-ob_mode: 1
content-encoding: gzip
vary: Accept-Encoding
expires: Fri, 18 Mar 2022 14:47:43 +0000
cache-control: no-store, no-cache, must-revalidate,  pre-check=0, post-check=0, max-age=0
pragma: no-cache
content-description: File Transfer
content-disposition: attachment; filename="REMOVED.csv"
content-transfer-encoding: binary
set-cookie: REMOVED path=/; secure; HttpOnly; SameSite=Strict
set-cookie: REMOVED path=/; secure; HttpOnly; SameSite=Strict
last-modified: Fri, 18 Mar 2022 14:47:43 GMT
content-type: text/comma-separated-values;charset=utf-8
date: Fri, 18 Mar 2022 14:47:42 GMT
server: Apache/2.4.52 (Unix) OpenSSL/1.1.1m
X-Firefox-Spdy: h2

[kamil-tekiela]

Related php/php-src#8218

[ophian]

Just to confirm this now being solved.
I had this export issue on 5.1.3 and PHP 8.1.4 with Firefox versions too on windows.
Adding the patch #17447 export runs well again,

[bessone]

I had the same problem with PhpMyAdmin 5.1.3 and PHP 8.0.17, both using Firefox and Chrome.

Applying the patch the problem disappeared.