“400 Bad Request” Why?
Question
This function is part of a PHP-CLI script using wxWidgets, which tries to post some fields to an Apache2 web server on my LAN. It always fails "400 Bad Request" and doesn't enter the "/blog/update.php" code. The value of the domain/host, which could be a critical part of this error, is correct. Why is it a bad request? All questions that are just like mine have no answers.
<?php
[...]
function upload_button_clicked()
{ global $file_box, $frame, $html_box, $remote_host, $title_box, $upload_button ;
// collect global variables
$upload_button->Disable();
$file = $file_box->GetValue();
$title = $title_box->GetValue();
$html = $html_box->GetValue();
// open stream to server
$messages = "";
$server = fsockopen($remote_host, 80, $errno, $errstring, 5);
if(!$server)
{ $messages .= "Cannot connect to $remote_host: $errno $errstring\n";
goto end;
}
$messages .= "Connected to $remote_host\n";
stream_set_timeout($server, 5);
// urlencode parameters
$body = "date=" . urlencode(date('d m Y'))
."&file=" . urlencode($file)
."&title=" . urlencode($title)
."&html=" . urlencode($html) ;
$body_length = strlen($body) +1; for the "\n" to terminate
// build POST request
$request = "POST /blog/update.php HTTP/1.1\n"
."Host: $remote_host\n"
."Content-Type: application/x-www-form-urlencoded\n"
."Content-Length: $body_length\n"
."\n"
.$body."\n";
// fwrite request to stream
loop:
$request_length = strlen($request);
$bytes_written = fwrite($server, $request, $request_length);
if($bytes_written === false)
{ $messages .= "Writing POST to $remote_host failed";
goto end ;
}
// deal with partial write
if($bytes_written < $request_length) // not all written
{ $request = substr($request, $bytes_written);
goto loop;
}
$messages .= "sent $file OK\n";
// read responses to POST
while(!feof($server))
{ $response = fgets($server, 1024);
$messages .= "$response\n";
}
// tidy up
end:
$report = new wxMessageDialog($frame, $messages, "Upload", wxOK|wxCENTRE);
fclose($server);
$upload_button->Enable();
return ;
}
[...]
?>
Terminal output:
Connected to mydomain.com
sent /home/.../blog/contents/201710090746+title.htm OK
HTTP/1.1 400 Bad Request
Date: Sun, 08 Oct 2017 21:46:08 GMT
Server: Apache
Content-Length: 285
Connection: close
Content-Type: text/html; charset=iso-8859-1
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>400 Bad Request</title>
</head><body>
<h1>Bad Request</h1>
<p>Your browser sent a request that this server could not understand.<br />
</p>
<hr>
<address>Apache Server at 127.0.0.1 Port 80</address>
</body></html>
2 answers
solution1
0 2017-10-09 01:08:46
Try
$body_length = strlen($body."\n");
The body you send to Apache is slightly longer than strlen($body) since you are appending a "\\n" to the end of $body . At least one other coder got a 400 Bad Request due to this.
solution2
0 2017-10-09 04:48:34
Try use \\r\\n instead just \\n like this:
$body_length = strlen($body);
// build POST request
$request = "POST /blog/update.php HTTP/1.1\r\n"
."Host: $remote_host\r\n"
."Content-Type: application/x-www-form-urlencoded\r\n"
."Content-Length: $body_length\r\n"
."\r\n"
.$body;
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