I have 2 return statements:

return $http.post({ url: CHEAPWATCHER.config.domain + 'api/Authenticate', contentType: 'application/x-www-form-urlencoded; charset=UTF-8', data: data }); return $.ajax({ type: 'POST', url: CHEAPWATCHER.config.domain + 'api/Authenticate', data: data }).done(function (result) { console.log('logged successfuly'); }).fail(function (result) { console.log('loging failed'); });

and my background.js function that uses API methods:

// REGISTER API COMMAND LISTENER chrome.runtime.onConnect.addListener(function (port) { port.onMessage.addListener(function (request, portInfo) { // Globally accessible function to execure API calls CHEAPWATCHER.executeApiCall = function (request, senderId) { var originalRequestMethod = request.method; //Dinamically call API method CHEAPWATCHER.api[request.method](request, senderId).then(function (response) { port.postMessage(response); }, function (error) { port.postMessage(error); }); }; CHEAPWATCHER.executeApiCall(request, request.sender); }); });

So ofcourse when I'm running my chrome extension I comment one of them, but the point is that both of them return the same object type jqXHR and if I'm using $http.post it gives me these errors:

Error in event handler for (unknown): TypeError: Cannot read property 'error' of null


POST chrome-extension://cmakfpdagfeiefcmmpmhjrtyhonmgnbi/background/[object%20Object] net::ERR_FILE_NOT_FOUND

and when I'm using $.ajax it works, I get the token I needed but it gives me this error:

Error in event handler for (unknown): TypeError: Cannot read property 'error' of null

and after that my extension can't continue working. Yesterday I asked why $.ajax gives me that error and I got answer because I can't return jqXHR type, but if I'm using

return $http.post(CHEAPWATCHER.config.domain + 'api/Authenticate', data); everything is fine just post method wants that I give him grant_type=password and Content-Type application/x-www-form-urlencoded so that's why I used $http.post([settings]) structure.

Can someone please explain me how they both work and why I'm getting these errors? Maybe I'm using post method incorrectly or I need to declare something more that I don't know?

You're not using $http.post correctly. This method take 3 parameters not one object like this :

return $http.post( CHEAPWATCHER.config.domain + 'api/Authenticate', transformDataToUrlEncoded(data), {contentType: 'application/x-www-form-urlencoded; charset=UTF-8'} });

As you can see i put a transformDataToUrlEncoded. Because angular only serialize in JSON he doesn't antively transform javascript object to urlencoded.

From old answer that is out of subject

$http.post return a promise on which you can use the .then. Angular promise are chanable, meaning you can do .then().then().then() again and again to have multiple layer of processing the result. Of course you don't need that often. I would say almost never than 2 level :

Processing the result from server and format data in a service layer Using the result in a controller layer

I don't really know about JQuery but i guess that's it's not chainable as angular.

You probably can do


Because .done return on object on which you can perform a .fail() but not


Because the object returned by .done doesn't have a .done() method.

Finally the .fail() is the terminate point : it return nothing so you return null value.

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