Can't connect to HTTPS site using cURL. Returns 0 length content instead. What can I do?

alex_31671 0
Viewed 105894

I have a site that connects using cURL (latest version) to a secure gateway for payment.

The problem is cURL always returns 0 length content. I get headers only. And only when I set cURL to return headers. I have the following flags in place.

curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($ch, CURLOPT_URL, $gatewayURI);
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_POST, 1);

The header returned is

HTTP/1.1 100 Continue

HTTP/1.1 200 OK
Date: Tue, 25 Nov 2008 01:08:34 GMT
Server: Microsoft-IIS/6.0
X-Powered-By: ASP.NET
Content-Length: 0
Content-Type: text/html
Set-Cookie: ASPSESSIONIDxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx; path=/
Cache-control: private

I have also tried cURL'ing different sites and they return content fine. I think the problem might have something to do with the https connection.

I have spoken with the company and they are unhelpful.

Has anyone else experienced this error and know a work around? Should I ditch cURL and try and use fsockopen() ?

Thank you. :)

https curl php
12 Answers

I had the same problem today. Curl comes with an outdated file to authenticate HTTPS certificates from.

get the new one from:

http://curl.haxx.se/ca/cacert.pem

save it into some dir on your site

and add 

curl_setopt ($curl_ch, CURLOPT_CAINFO, dirname(__FILE__)."/cacert.pem");

To every request :-)

IGNORE any dumbass comments about disabling CURLOPT_VERIFYPEER and CURLOPT_VERIFYHOST!! That leaves your code vulnerable to man in the middle attacks!

December 2016 edit:

Solve this properly by using Jasen's method mentioned below.

add curl.cainfo=/etc/ssl/certs/ca-certificates.crt to you php.ini

October 2017 edit:

There is now a composer package that helps you manage the ca certificates, so that you're not vulnerable if your cacert.pem becomes outdated due to revoking certificates.

https://github.com/paragonie/certainty -> composer require paragonie/certainty:dev-master

user_180770

You should also try checking the error messages in curl_error(). You might need to do this once after each curl_* function.

http://www.php.net/curl_error

user_288350

Whenever I'm testing something with PHP/Curl, I try it from the command line first, figure out what works, and then port my options to PHP.

Issac_Kelly_1440

Sometimes you have to upgrade your Curl certificates to latest version not to have errors with https.

user_953530

I used file_get_contents using stream_create_context and it works fine:

$postdataStr = http_build_query($postdataArr);

$context_options = array (
        'http' => array (    <blink> // this will allways be http!!!</blink>
            'method' => 'POST',
            'header'=> "Content-type: application/x-www-form-urlencoded\r\n"
                . "Content-Length: " . strlen($postdataArr) . "\r\n"
                . "Cookie: " . $cookies."\r\n"
            'content' => $postdataStr
            )
        );

$context = stream_context_create($context_options);
$HTTPSReq = file_get_contents('https://www.example.com/', false, $context);
Admin1

there might be a problem at your web hosting company from where you are testing the secure communication for gateway, that they might not allow you to do that.

also there might be a username, password that must be provided before connecting to remote host.

or your IP might need to be in the list of approved IP for the remote server for communication to initiate.

Admin1

You are using POST method, but are you providing an array of data? E.g.

curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
user_288350
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