Hi, sorry I was not detailed enough. Yes, I am using the POST example from the CURL repository. I originally was trying the sendrecv example. I replaced the send portion with the POST portion and was still using the receive part. Here is what I am getting with VERBOSE turned on (BTW, I did not understand VERBOSE, thanks for the info):

You are using libcurl/7.28.1


* About to connect() to acc.dwd.wisconsin.gov port 443 (#0)
* Trying 167.218.117.18...
* connected
* Connected to acc.dwd.wisconsin.gov (167.218.117.18) port 443 (#0)
* SSL connection using AES256-SHA
* Server certificate:
* subject: C=US; ST=Wisconsin; L=Madison; O=State of Wisconsin - DWD; OU=Administrative Services; CN=*.wisconsin.gov
* start date: 2012-09-11 00:00:00 GMT
* expire date: 2015-11-18 12:00:00 GMT
* subjectAltName: acc.dwd.wisconsin.gov matched
* issuer: C=US; O=DigiCert Inc; OU=www.digicert.com; CN=DigiCert High Assurance CA-3
* SSL certificate verify result: unable to get local issuer certificate (20), continuing anyway.
* Connection #0 to host acc.dwd.wisconsin.gov left intact
Sending request.
* Re-using existing connection! (#0) with host acc.dwd.wisconsin.gov
* Connected to acc.dwd.wisconsin.gov (167.218.117.18) port 443 (#0)
* Connection #0 to host acc.dwd.wisconsin.gov left intact
Reading response.
Recieve Error: Socket not ready for send/recv

It seems to be a problem with the socket. Here is the actual code:

res = curl_global_init(CURL_GLOBAL_ALL);
            /* Check for errors */
            if(res != CURLE_OK)
            {
                fprintf(stderr, "curl_global_init() failed: %s\n",
                curl_easy_strerror(res));
                return 1;
            }

            curl = curl_easy_init();
            if(curl)
            {
               printf("\n\n\nYou are using libcurl/%s\n\n\n", curl_version_info(CURLVERSION_NOW)->version);
               curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);

               /* specify target URL */
               curl_easy_setopt(curl, CURLOPT_URL, url);

               curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, FALSE);

               curl_easy_setopt(curl, CURLOPT_CONNECT_ONLY, 1L);
               res = curl_easy_perform(curl);

               if(CURLE_OK != res)
               {
                   printf("Error: %s\n", strerror(res));
                   return 1;
               }

               /* Extract the socket from the curl handle - we'll need it for waiting.
                * Note that this API takes a pointer to a 'long' while we use
                * curl_socket_t for sockets otherwise.
               */
               res = curl_easy_getinfo(curl, CURLINFO_LASTSOCKET, &sockextr);

               if(CURLE_OK != res)
               {
                   printf("Error: %s\n", curl_easy_strerror(res));
                   return 1;
               }

               sockfd = sockextr;

               /* wait for the socket to become ready for sending */
               if(!wait_on_socket(sockfd, 0, 60000L))
               {
                   printf("Error: timeout.\n");
                   return 1;
               }

               curl_easy_setopt(curl, CURLOPT_POSTFIELDS, full_msg);
               /* Perform the request, res will get the return code */
               res = curl_easy_perform(curl);
               /* Check for errors */
               if(res != CURLE_OK)
               {
                   fprintf(stderr, "curl_easy_perform() failed: %s\n",
                   curl_easy_strerror(res));
               }

               puts("Reading response.");

               /* read the response */
               wait_on_socket(sockfd, 1, 60000L);
               res = curl_easy_recv(curl, s1, BUF_SZ9, &iolen);

               if(CURLE_OK != res)
               {
                   printf("Recieve Error: %s\n", curl_easy_strerror(res));
                   return 1;
               }

               nread = (curl_off_t)iolen;
               printf("Received %" CURL_FORMAT_CURL_OFF_T " bytes.\n", nread);

               /* always cleanup */
               curl_easy_cleanup(curl);

            }

Thank you for your help…..

Kevin Fitzgerald
Provider SE
Eligibility/SSI SE
Healthcheck SE
TPL SE
Batch Promotion Coordinator
HP Enterprise Services
Work: 847-485-8060
Cell: 847-204-5077
kevin.fitzgerald_at_hp.com

From: curl-library [mailto:curl-library-bounces_at_cool.haxx.se] On Behalf Of Ray Satiro via curl-library
Sent: Thursday, June 18, 2015 1:42 AM
To: curl-library_at_cool.haxx.se
Subject: Re: New to CURL - HTTP POST to web service and response

On 6/17/2015 3:12 PM, Fitzgerald, Kevin wrote:

Hello, I am very new to CURL and I am trying to figure out the best/correct way to use CURL to perform the functions that I need to perform. I have written a C program running on an HP/UX box. I need to perform an HTTP POST to a web service and then receive a response back from the server. I have tried different things from examples I have seen, but so far I have not been successful. Is there an example out there that will show me what I need to code using CURL? I have found parts in different examples, but not one that does all that I need to do.


Please be more specific. What examples are you working from? Do you get an error? Can you give us verbose output? Enable verbosity, also show the libcurl version your program is using:

printf("\n\n\nYou are using libcurl/%s\n\n\n", curl_version_info(CURLVERSION_NOW)->version);
curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);

There is a simple POST example in docs/examples/http-post.c [1].


[1]: http://curl.haxx.se/libcurl/c/http-post.html

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Received on 2015-06-18