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Errors in Symfony

I do not know why but the code in the pictures assignments that needs up upload a picture does not work with Symfony when talkig to localhost or ngrok.

If you don't add the file form item in the PHP code, Symfony always blows up with:

Fatal error: Uncaught ValueError: Path cannot be empty in 
/Users/csev/htdocs/dj4e/tsugi/vendor/symfony/mime/Part/TextPart.php:149

If you do add the file form, Symfony can submit file input tags, to www.pythonanywhere.com but not to localhost or ngrok. It blows up with a CSRF error in the browser and this in the Django log:

[12/Apr/2025 14:56:46] "GET /mp/ad/create HTTP/1.1" 200 5653
Forbidden (CSRF token missing.): /mp/ad/create
[12/Apr/2025 14:56:46] "POST /mp/ad/create HTTP/1.1" 403 2506
[12/Apr/2025 14:56:46] code 400, message Bad request syntax ('c')
[12/Apr/2025 14:56:46] "c" 400 -

That is some scary crap. I tried to use ngrok's protocol dumping capabilities and it can't parse the message that is sent from Symfony to Django except as a binary message. That points a finger at Symfony's serialization getting confused outbound when it is talking to localhost.

But tracing through Symfony's AbstractBrowser and HttpClient is pretty dense. I am sure it a a really weird Symfony bug that will never be fixed. I advanced the Symfony version to no avail.

The Workaround

Since it seemed that non-file form posts worked well, perhaps if deep inside Symfony we could hack it so it never sent files it might be a workaround. And here it is as a patch

--- a/vendor/symfony/browser-kit/AbstractBrowser.php
+++ b/vendor/symfony/browser-kit/AbstractBrowser.php
@@ -355,6 +355,7 @@ abstract class AbstractBrowser
 
         $server['HTTPS'] = 'https' === parse_url($uri, \PHP_URL_SCHEME);
 
+        $files = [];
         $this->internalRequest = new Request($uri, $method, $parameters, $files, $this->cookieJar->allValues($uri), $server, $content);
 
         $this->request = $this->filterRequest($this->internalRequest);

Just as a note - I think this could be fixed in mime/Part/TextPart.php but it won't be a simple 1-line fix (I tried).

How to patch

vi tsugi/vendor/symfony/browser-kit/AbstractBrowser.php

Go to line 358 (approx) and add the code to set the files parameter to an empty array.

-- Chuck Sat Apr 12 11:04:41 EDT 2025