How to add curl HTTP Headers for authentication in PHP?

Question

I want to add the HTTP headers for authenticating Udemy API access.Can someone tell me as to how to add the headers.I already have the client id and secret key.I want to access the API from a PHP page. https://developers.udemy.com/ Here is the code i tried using:

$ch = curl_init($request);
curl_setopt($ch, CURLOPT_URL, $request);
curl_setopt($ch,CURLOPT_HTTPHEADER,array('X-Udemy-Client-Id:MY_ID','X-Udemy-Client-Secret:Secret'));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
$results= curl_exec($ch);
echo $results;

Output:

Blank Page

Can someone point out what the problem might be?

Why are you running a curl request and then file_get_contents? echo $results; — drmarvelous
– drmarvelous, Commented Aug 20, 2014 at 14:38
@drmarvelous I basically want to access the API feed which is in json format in a wordpress theme.But it is not authenticated. — Dead lock
– Dead lock, Commented Aug 20, 2014 at 14:40
Correct, but you're already doing that with curl. Right now you are performing TWO different requests (albeit mal-formed) — drmarvelous
– drmarvelous, Commented Aug 20, 2014 at 14:41

hindmost · Accepted Answer · 2014-08-21 13:43:49Z

2

As @drmarvelous wrote, you perform two requests (1st - by CURL, and 2nd - by file_get_contents) which does the same. Wherein the result of CURL request is not actually used in your script. It use the result of file_get_contents request which is performed without authentication parameters. Because of this you getting Unauthorized error.

So you have to use the result of CURL request:

...
$json = json_decode($results, true);
print_r($json);

Update:

You have to ensure you use valid URL for API request, i.e. value of $request in your code should be valid URL. Also, ensure you pass valid authentication parameters (Client-Id and Client-Secret) by HTTP headers.

Furthermore, since API is secured, you have to disable SSL peer verification by setting CURLOPT_SSL_VERIFYPEER option to false.

So the code should look like this:

$ch = curl_init($request);
curl_setopt($ch, CURLOPT_URL, $request);
curl_setopt($ch,CURLOPT_HTTPHEADER,array('X-Udemy-Client-Id: {YourID}','X-Udemy-Client-Secret: {YourSecret}'));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
$results= curl_exec($ch);
echo $results;

edited Aug 21, 2014 at 13:43

answered Aug 20, 2014 at 15:43

hindmost

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7 Comments

Dead lock Over a year ago

Hey i tried making those changes and have updated the post but when i use echo $results; It gives a blank page.

hindmost Over a year ago

But what you've expected? Some message? I think that a blank page is a normal response to authentication request. I.e. "no messages" means "OK" (no errors).

Dead lock Over a year ago

Oh i was expecting a feed as shown on the api page.I want to access the feed data.

hindmost Over a year ago

You cannot get data on authentication request. It's only for authenticating user, not for getting data

Dead lock Over a year ago

Even if i enter a wrong API secret key it shows a blank page.For accessing the data after authentication what do i have to do?

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