Preparing http request url in interceptors in AngularJS - angularjs

Question

I tried to prepare http request url in interceptors rather than adding it to the object passed in $http. Here is the sample of code I tried:
angular.module('myapp', [])
.service('myservice', function() {
this.myfunction = function() {
var req = {method: 'POST', reqName: 'getInfo'};
return $http(req);
}
})
.factory('myInterceptor', function() {
var interceptor = {
'request': function(config) {
config.url = "http://www.myapi.com/demo/"+config.reqName;
return config;
}
}
return interceptor;
})
.config(function($httpProvider) {
$httpProvider.interceptors.push('myInterceptor');
})
But I'm getting an error, which says:
Error: [$http:badreq] Http request configuration url must be a string.
Received: undefined
Any help?

Answer 1

Let me show some tests that proof AngularJS documentation is correct.
Some details about Interceptor - http://docs.angularjs.org/api/ng/service/$http#interceptors
angular.module('myApp', [])
.service('service', function($http) {
this.myfunction = function() {
var req = {
method: 'POST',
reqName: 'getInfo'
};
return $http(req);
}
})
.factory('myInterceptor', function() {
var interceptor = {
'request': function(config) {
config.url = "http://www.myapi.com/demo/" + config.reqName;
return config;
}
}
return interceptor;
})
.config(function($httpProvider) {
$httpProvider.interceptors.push('myInterceptor');
})
describe("myApp", function() {
beforeEach(module("myApp"));
it("executes intercpetor that changes request", inject(function(service, $httpBackend) {
$httpBackend.expectPOST("http://www.myapi.com/demo/getInfo").respond(201, []);
service.myfunction().then(function(r) {
expect(r.config.url).toBe('http://www.myapi.com/demo/getInfo')
})
$httpBackend.flush();
}));
});
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