MICROSOFT_PRESS_EBOOK_PROGRAMMING_WINDOWS_8_APPS_WITH_HTML_CSS_AND_JAVASCRIPT_PDF

);
"form-data", "-----------------------------7d44e178b0434")
.then(function (uploadOperation) {
// Start the upload and persist the promise
upload = uploadOperation;
promise = uploadOperation.startAsync().then(complete, error, progress);
}
The resulting request will look like this, very similar to what’s shown on the Flickr page (just with
some extra headers):
POST /website/multipartupload.aspx HTTP/1.1
Cache-Control=no-cache
Connection=Keep-Alive
Content-Length=1328
Content-Type=multipart/form-data; boundary="-----------------------------7d44e178b0434"
Accept=*/*
Accept-Encoding=gzip, deflate
Host=localhost:60355
User-Agent=Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Win64; x64; Trident/6.0; Touch)
UA-CPU=AMD64
-------------------------------7d44e178b0434
Content-Disposition: form-data; name="api_key"
3632623532453245
-------------------------------7d44e178b0434
Content-Disposition: form-data; name="auth_token"
436436545
-------------------------------7d44e178b0434
Content-Disposition: form-data; name="api_sig"
43732850932746573245
-------------------------------7d44e178b0434
Content-Disposition: form-data; name="photo"; filename="tinysquare.jpg"
Content-Type: image/jpeg
{RAW JFIF DATA}
-------------------------------7d44e178b0434--
To run the sample and also see how this request is received, go to the MultipartUploadServer folder
in this chapter’s companion content. Load website.sln into Visual Studio 2012 Express for Web, open
MultipartUploadServer.aspx, and set a breakpoint on the first if statement inside the Page_Load
method. Then start the site in Internet Explorer to open that page on a localhost debugging port. Copy
that page’s URI for the next step.
In the Multipart Upload example, paste that URI into the URI field and click the Start Multipart
Transfer. When the upload operation’s startAsync is called, you should hit the server page breakpoint
in Visual Studio for Web. You can step through that code if you want and examine the Request object;
in the end, the code will copy the request into a file named multipart-request.txt on that server. This will
contain the request contents as above, where you can see the relationship between how you set up the
parts in the client and how they are received by the server.
651