How to post http request using digest authentication with libcurl

Question

I'm trying to perform a post request and I'm trying to do it with the digest authentication. with libcurl, I set the options:

curl_easy_setopt(curl_handle, CURLOPT_HTTPAUTH, CURLAUTH_DIGEST);

curl_easy_setopt(curl_handle, CURLOPT_USERPWD, "username:password");

before setting all the other option (post, url and everything). The server closes my connection and I think that no digest is made. I just don't know how to automatically obtain the challenge-response behaviour of the digest. If I set HTTPAUTH to CURLAUTH_BASIC it encodes the stuff, I see with the VERBOSE option the header containing authorization = basic. With digest no headers.

Do you know how can I do it, or can you give me some example? I really searched everywhere.

deltheil · Accepted Answer · 2013-05-29 08:11:26Z

7

For a basic POST request you should do:

curl_easy_setopt(hnd, CURLOPT_USERPWD, "user:pwd");
curl_easy_setopt(hnd, CURLOPT_HTTPAUTH, (long)CURLAUTH_DIGEST);
curl_easy_setopt(hnd, CURLOPT_CUSTOMREQUEST, "POST");

For a multipart POST (a.k.a multipart/form-data):

struct curl_httppost *post;
struct curl_httppost *postend;
/* setup your POST body with `curl_formadd(&post, &postend, ...)` */
curl_easy_setopt(hnd, CURLOPT_USERPWD, "user:pwd");
curl_easy_setopt(hnd, CURLOPT_HTTPPOST, post);
curl_easy_setopt(hnd, CURLOPT_HTTPAUTH, (long)CURLAUTH_DIGEST);
curl_easy_setopt(hnd, CURLOPT_CUSTOMREQUEST, "POST");

Pro-tip: use curl command-line tool with --libcurl request.c: it outputs into this C file the list of options used to perform the corresponding request.

edited May 29, 2013 at 8:11

answered May 29, 2013 at 7:50

deltheil

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5 Comments

Gioia Over a year ago

I tried, but it does not work properly...I should receive the challenge and I don't receive anything, do I have to write more code after the code you send me? do I have to set headers or something similar?

deltheil Over a year ago

Then you should have a problem server-side. Of course you must set the CURLOPT_URL option, but otherwise this is all that you need. And I do confirm it works (e.g see these real world examples). Once again I do recommend you to perform the same request on the command-line, on your own service, with the --libcurl out.c option: it will output everything you need.

Gioia Over a year ago

Yeah! now it works! It was a problem of the server as you suggest. I thank you so much my friend, have a good day.

Salih Mutlu Dec 7 at 10:41

Hi, what was the problem on server side. I faced the same situation while downloading a file.

Shafik Yaghmour Over a year ago

@Gioia it seems you found this answer useful, if so you should consider accepting it.

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