Bad Request. Connecting to sites via curl on host and system

This is more a comment than an answer: From your question it’s not clear what specifically triggers the 400 error nor what especially means it or more concrete: the source of it.

Is that the output by your server? Is that some feedback (the curl response) that you output with your script?

To better debug things, I’ve come up with a slightly different form of configuration you might be interested in when using the curl extension. There is a nice function called curl_setopt_array which allows you to set multiple options at once. It will return false if one of the options fails. It allows you to configure your request in complete in front. So you can more easily inject and replace it with a second (debug) configuration:

$curlDefault = array(
    CURLOPT_PORT => 80, // ignore explicit setting of port 80
    CURLOPT_RETURNTRANSFER => TRUE,
    CURLOPT_FOLLOWLOCATION => TRUE,
    CURLOPT_ENCODING => '',
    CURLOPT_HTTPHEADER => array(
        'Proxy-Connection: Close',
        'User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1017.2 Safari/535.19',
        'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
        'Accept-Encoding: gzip,deflate,sdch',
        'Accept-Language: en-US,en;q=0.8',
        'Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3',
        'Cookie: __qca=blabla',
        'Connection: Close',
    ),
    CURLOPT_VERBOSE => TRUE, // TRUE to output verbose information. Writes output to STDERR, or the file specified using CURLOPT_STDERR.
);

$url = "http://stackoverflow.com/questions/tagged/java";
$handle = curl_init($url);
curl_setopt_array($handle, $curlDefault);
$html = curl_exec($handle);
curl_close($handle);

This might help you to improve the code and to debug things.

Furthermore you’re making use of the CURLOPT_VERBOSE option. This will put the verbose information into STDERR – so you can’t track it any longer. Instead you can add it to the output as well to better see what’s going on:

...
    CURLOPT_VERBOSE => TRUE, // TRUE to output verbose information. Writes output to STDERR, or the file specified using CURLOPT_STDERR.
    CURLOPT_STDERR => $verbose = fopen('php://temp', 'rw+'),
);

$url = "http://stackoverflow.com/questions/tagged/java";
$handle = curl_init($url);
curl_setopt_array($handle, $curlDefault);
$html = curl_exec($handle);
$urlEndpoint = curl_getinfo($handle, CURLINFO_EFFECTIVE_URL);
echo "Verbose information:\n<pre>", !rewind($verbose), htmlspecialchars(stream_get_contents($verbose)), "</pre>\n";
curl_close($handle);

Which gives sort of the following output:

Verbose information:
* About to connect() to stackoverflow.com port 80 (#0)
*   Trying 64.34.119.12...
* connected
* Connected to stackoverflow.com (64.34.119.12) port 80 (#0)
> GET /questions/tagged/java HTTP/1.1
Host: stackoverflow.com
Proxy-Connection: Close
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1017.2 Safari/535.19
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Encoding: gzip,deflate,sdch
Accept-Language: en-US,en;q=0.8
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
Cookie: __qca=blabla
Connection: Close

< HTTP/1.1 200 OK
< Cache-Control: private
< Content-Type: text/html; charset=utf-8
< Content-Encoding: gzip
< Vary: Accept-Encoding
< Date: Mon, 05 Mar 2012 17:33:11 GMT
< Connection: close
< Content-Length: 10537
< 
* Closing connection #0

Which should provide you the information needed to track things down if they are request/curl related. You can then easily change parameters and see if it makes a difference. Also compare the curl version you have installed locally with the one on the server. To obtain it, use curl_version:

$curlVersion = curl_version();
echo $curlVersion['version']; // e.g. 7.24.0

Hope this helps you to track things down.

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