Unknown POST Content-Length exceeds limit

Question

Warning: Unknown: POST Content-Length of 49 bytes exceeds the limit of 40 bytes in Unknown on line 0

Warning: Cannot modify header information - headers already sent in Unknown on line 0

My HTML passes 4 string parameters to a a PHP trough a POST form, and when I do not enter anything I get these errors up until I get to the portion of my code that checks if a string from $_POST is empty.

I looked it up online and it was all stuff related to file uploading, but why exactly is it happening to me?

And what else should I know about creating a stable PHP script? I don't want my users to see these kinds of things. Maybe I can at the very least server one of my own pages instead of these to serve the errors to the client?

Thank you!

    <html>
    
        <body>
        
        <form action="register.php" method="POST">
            <input type="text" name="ID" placeholder="ID"><br>
            <input type="text" name="PASS"  placeholder="Password"><br>
            <input type="text" name="UID" placeholder="ID2"><br>
            <input type="text" name="UPASS" placeholder="Password2"><br>
        
            <input type="submit" value="Register">
        </form>
        
        </body>
        
        </html>

php.ini file.

The HTML code? The error in my PHP script occurs right at the beginning, it's not hitting my code before warning me — orORorOR, Jun 25 '20 at 12:35
Does this answer your question? [POST Content-Length exceeds the limit](https://stackoverflow.com/questions/6279897/post-content-length-exceeds-the-limit) — IncredibleHat, Jun 25 '20 at 12:37
No. that person had users uploading too big of files, I get these errors when passing absolutely no data to the PHP script — orORorOR, Jun 25 '20 at 12:39
we have to start somewhere. what you have done, we have the issue. — Vidal, Jun 25 '20 at 12:39
As I expected, and that linked post covers. `post_max_size=40` A misconfigured php.ini. — IncredibleHat, Jun 25 '20 at 12:43
What **is** your post_max_size? It's apparently 40 bytes, which is way too low. — aynber, Jun 25 '20 at 12:43
Yeah I think that's a problem, but why is it popping up when I pass nothing and not when I pass actual strings? — orORorOR, Jun 25 '20 at 12:44
A POST (even empty fields) can be bigger than 40 bytes, because its including the post body and variable names to create the request. It all gets counted up. Its not just 'the values', its 'everything'. — IncredibleHat, Jun 25 '20 at 12:46

Vidal · Accepted Answer · 2020-06-25T12:45:14.933

3

Update your value on the php.ini file from post_max_size=40 to a bigger value. 40m for example.

and restart your apache after the change is done.

edited Jun 25 '20 at 12:45

answered Jun 25 '20 at 12:44

Vidal

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You'll notice in his php.ini that it is first defined as `post_max_size=40M`, but then later in the same ini, its redefined as `post_max_size=40` ... oops. – IncredibleHat Jun 25 '20 at 12:44

Unknown POST Content-Length exceeds limit

1 Answers1