AngularJs Patch Request

Question

I am trying to update data through my API using http Patch method. But i am getting a Bad Response or Internal Server Error.

Here is my JSON call:

$http.patch(baseUrl + '/users/' + currentUserEmail,data).success(success).error(error)

My API PATCH Method needs an IF-Match header but isn't it added automatically? — Aslam
– Aslam, Commented Oct 28, 2015 at 8:29

Alexandre Nucera · Accepted Answer · 2015-10-28 09:36:10Z

2

You can add needed headers using the optional 3rd params of $http.patch :

var config = {headers: {'IF-Match': 'your-data'}};
$http.patch(baseUrl + '/users/' + currentUserEmail,data, config).success(success).error(error)

The documentation provides info about custom config options.

If you wish to add custom headers to every request automatically you can use the $http interceptor :

angular.module('app').factory('HttpInterceptor', function () {
  return {
    request: function (config) {
      if (config.method === 'PATCH')
         config.headers['IF-Match'] = 'your-data';
      return config;
    }
  };
});

angular.module('app').config(['$httpProvider', '$resourceProvider', function ($httpProvider, $resourceProvider) {
    // Add the interceptor to the $httpProvider to intercept http calls
    $httpProvider.interceptors.push('HttpInterceptor');
}])

EDIT: to answer your comment about how to get info from GET request. In the http interceptor, you can intercept response as well :

angular.module('app').factory('HttpInterceptor', function () {
 var etag = null;
  return {
    request: function (config) {
      if (config.method === 'PATCH')
         config.headers['IF-Match'] = etag;
      return config;
    },
   response: function (response) {
      if (response.config.method === 'GET')
          etag = reponse.config.headers['e-tag'];
        // Return the response or promise.
      return response || $q.when(response);
    },
  };
});

edited Oct 28, 2015 at 9:36

answered Oct 28, 2015 at 9:03

Alexandre Nucera

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9 Comments

Aslam Over a year ago

How to get the If-Match Data, as it should be equal to E-Tag value from a Get Response? How can i read that value?

Alexandre Nucera Over a year ago

Print the config object in the http interceptor, it contains everything you need

Aslam Over a year ago

I am able to add the If-Match value to the request, but still not clear about how to get the value from the response of a get method

Alexandre Nucera Over a year ago

I edited my answer (with pseudo code, I have not test it)

Aslam Over a year ago

Yes, i have changed config to response in the response function, but all i am getting is NULL. I think the response function is properly getting the response form the server. Any ideas?

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