How Do
Webhooks
Webhooks

Call a webhook using curl

You can also use the Linux curl library to call a webhook on the command line or from your program (curl is also available for Cygwin on Windows).

Curl is quite powerful and you can construct GET and POST messages and send the data you need to.

In this example we use curl on the command line to call the webhook that goes to our PC server and displays a message in a text box.


Curl webhook 
curl 'http://iotha.co.uk/webhook_call.php?dev=PC&com=msg&val=Hello'

We can also create a GET request using C. These examples are available in the download.

Curl GET 
#include 
#include 

int main(void)
{
  CURL *curl;
  CURLcode res;

  curl = curl_easy_init();
  if(curl)
  {
    curl_easy_setopt(curl, CURLOPT_URL, "http://iotha.co.uk/webhook_call.php?com=msg&val=Hello&dev=PC");
    curl_easy_setopt(curl, CURLOPT_HTTPGET, 1L);
    curl_easy_setopt(curl, CURLOPT_HTTP_VERSION, (long)CURL_HTTP_VERSION_2);

    res = curl_easy_perform(curl);

    if(res != CURLE_OK)
    {
      fprintf(stderr, "Failed: %s\n", curl_easy_strerror(res));
    }
    curl_easy_cleanup(curl);
  }
  return 0;
}

Or we can create a POST request and add more information to the body.

Curl POST 
#include 
#include 

int main(void)
{
  CURL *curl;
  CURLcode res;

  curl = curl_easy_init();
  if(curl)
  {
    curl_easy_setopt(curl, CURLOPT_URL, "http://iotha.co.uk/webhook_call.php?com=msg&val=Hello&dev=PC");
    curl_easy_setopt(curl, CURLOPT_POSTFIELDS, "Value=A Value&Key=Pair");
    curl_easy_setopt(curl, CURLOPT_POST, 1L);
    curl_easy_setopt(curl, CURLOPT_HTTP_VERSION, (long)CURL_HTTP_VERSION_2);

    res = curl_easy_perform(curl);

    if(res != CURLE_OK)
    {
      fprintf(stderr, "Failed: %s\n", curl_easy_strerror(res));
    }
    curl_easy_cleanup(curl);
  }
  return 0;
}