PHP - Debugging Curl

user_299216 0
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I'd like to see what the post fields in the request are before I send it. (For debugging purposes).

The PHP library (class) I am using is already made (not by me), so I am trying to understand it.

As far as I can tell, it uses curl_setopt() to set different options like headers and such and then it uses curl_exec() to send the request.

Ideas on how to see what post fields are being sent?

curl php debugging
8 Answers

If you just want a very quick way to debug the result:

$ch = curl_init();
curl_exec($ch);
$curl_error = curl_error($ch);
echo "<script>console.log($curl_error);</script>"
user_17949610

Output debug info to STDERR:

$curlHandler = curl_init();

curl_setopt_array($curlHandler, [
    CURLOPT_URL => 'https://postman-echo.com/get?foo=bar',
    CURLOPT_RETURNTRANSFER => true,

    /**
     * Specify debug option
     */
    CURLOPT_VERBOSE => true,
]);

curl_exec($curlHandler);

curl_close($curlHandler);

Output debug info to file:

$curlHandler = curl_init();

curl_setopt_array($curlHandler, [
    CURLOPT_URL => 'https://postman-echo.com/get?foo=bar',
    CURLOPT_RETURNTRANSFER => true,

    /**
     * Specify debug option.
     */
    CURLOPT_VERBOSE => true,

    /**
     * Specify log file.
     * Make sure that the folder is writable.
     */
    CURLOPT_STDERR => fopen('./curl.log', 'w+'),
]);

curl_exec($curlHandler);

curl_close($curlHandler);

See https://github.com/andriichuk/php-curl-cookbook#debug-request

user_106984080

Another (crude) option is to utilize netcat for dumping the full request:

nc -l -p 8000 -w 3 | tee curldbg.txt

And of course sending the failing request to it:

curl_setup(CURLOPT_URL, "http://localhost/testytest");

Notably that will always hang+fail, since netcat won't ever construct a valid HTTP response. It's really just for inspecting what really got sent. The better option, of course, is using a http request debugging service.

user_3450310
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