By Tao Liu
Expand your C# abilities to F#—and create analytical, data-rich computational and parallel software program parts swifter. subject matters comprise F# for OOP, sensible, and significant programming; F# and C# information constructions; layout styles; real-world apps.
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Extra info for F# for C# Developers
Headers that aren’t “official” can always be used (sometimes they are prefixed with X- but they don’t have to be), so you can make use of this in your own applications if you wish. A good example, often seen on the Web, is when a tool such as Varnish has been involved in serving a response, and it adds its own headers. 1 varnish Connection: keep-alive That additional X-Varnish header shows me that Varnish served the request. info and on the Web. A great example comes from GitHub. v3 X-GitHub-Request-Id: 5EC19EE1:61C0:10B4CDB:55A0DAD5 X-Content-Type-Options: nosniff X-Served-By: 13d09b732ebe76f892093130dc088652 There are a few custom headers in this example but the X-RateLimit-* headers are particularly worth noting; they check whether too many requests are being made.
In fact, this is a PHP array (because those are easy to understand and work with), which is then converted to JSON using json_encode(). The resulting output is given as the value for CURLOPT_POSTFIELDS and PHP sends it as the body of the request. This example also sets some headers using the CURLOPT_HTTPHEADER option. The first one is Content-Type, which we have already seen in many examples, and the second one is Authorization. The Authorization header here includes the “token” and the access token within it, because the GitHub API uses OAuth2 for authorization.
In order to use PHP to make a request that the previous script can handle, it is neces‐ sary to create the contents of the body of the request and specify that it is a PUT request. info The PUT verb is specified in this example, and the correct header for the formencoded data is set. We dictate the data to PUT (manually building the form elements into a string) and then send the request. We will discuss more about other data for‐ mats in Chapter 5 and Chapter 6, which cover JSON and XML specifically, but the basic principles of preparing the data and setting the Content-Type header accord‐ ingly still stand.