feat(http): add support for blob as a response type

[cassand]

Please check if the PR fulfills these requirements

• [ x ] The commit message follows our guidelines: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit-message-format
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

What kind of change does this PR introduce? (check one with "x")

[ ] Bugfix
[ x ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Other... Please describe:

What is the current behavior?
There is no way to receive a response as a blob.

What is the new behavior?
Allow to set the attribute responseType of the request, through the enum ResponseContentType.

Does this PR introduce a breaking change? (check one with "x")

[ ] Yes
[ x ] No

Other information:

In order to add appropriate tests for this feature I have to introduce some change into the MockBrowserXHR, (which will also allow to test arraybuffer, json and text as a responseType), therefore I will add them in a future commit.

[zoechi]

related to angular/http#75 ?

[vicb]

Why do we need to explicitly assign value here ?

[cassand]

This is generated by the command gulp public-api:update, if the values are not explicitly assigned, then any call to gulp public-api:update will put back the values.

[vicb]

you're right. didn't notice it was a .d.ts file before

[vicb]

Please add tests. Thanks

[cassand]

@vicb Sure, but I will need this PR #10194 to be merged in order to add appropriate tests (without this the attribute responseType can't be tested and the rest is already covered with tests in #7260 ).

[vicb]

@cassand please merge both the PRs and add tests. Thanks

[cassand]

Both requests are merged and the feature is tested.

[tomalex0]

I'm forced to ask here as i don't got any response from gitter.

Any example showcasing sending FormData as part of http,

Below code works fine for me but like to know if same supported in http

 var files = $event.target.files || $event.srcElement.files;
        var file = files[0];
        let formData = new FormData();
        formData.append("single_fileup", file);
        formData.append('key1', 'value1');
        formData.append('key2', 'value2');
       var req = new XMLHttpRequest();
       req.open("POST", "/api/fileupload");
       req.send(formData);

var multer  = require('multer');
var storage = multer.memoryStorage();
var upload = multer({ storage: storage });
  router.post('/api/fileupload', upload.single('single_fileup'), function(req, res, next){

});

How to make below code work?

 this.http.post('/api/fileupload', formData)
            .map(this.extractData)
            .catch(this.handleError);

I have posted same here also http://stackoverflow.com/questions/39731066/how-to-upload-filesmultipart-using-angularjs2

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