By Badrinarayanan Lakshmiraghavan
Functional ASP.NET net API will give you a hands-on and code-focused demonstration of the ASP.NET net API in motion. From the very starting, you will be writing operating code which will see most sensible practices and ideas in motion. because the ebook progresses, the techniques and code becomes extra subtle. starting with an summary of the internet carrier version in most cases and net API particularly, you will growth fast to a close exploration of the request binding and reaction formatting that lie on the middle of internet API. you will examine a variety of situations and notice how they are often manipulated to accomplish the consequences you would like.
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8 Creating a Custom Trace Writer In this exercise, you will create a custom trace writer that writes XML elements. ITraceWriter interface. 1. 2. 2, open it. 2. Create a new class WebApiTracer implementing ITraceWriter, as shown in Listing 2-4. Tracing. We need the latter. Tracing; directive. Listing 2-4. Flush(); } } 3. 4. } } Visual Studio shows a wavy red underline for the types that need using directives. You can right-click each one and choose the namespace to resolve it. Listing 2-4 shows the required using directives preceding the class definition.
Paste the headers (first two lines) in Request Headers and the JSON in the Request Body text box. Listing 2-3. POST Request 6. 7. Host: localhost:55778 Content-Type: application/json {"Id":12348,"FirstName":"Philip","LastName":"Hughes"} Click the Execute button. Visual Studio hits the break point. Inspect the parameter. NET Web API should have created the parameter Employee object based on the JSON in the request body, as shown in Figure 2-5. info Chapter 2 ■ Debugging and Tracing Figure 2-5. Execution Breaking in the Action Method in Visual Studio ■■Note The Content-Type request header is important; without it the Employee parameter of the action method will be null.
The client sends a request message to the server; the server processes the request and sends a response message back to the client and these steps constitute an HTTP transaction. An HTTP request begins with the request line as its first line. The request line starts with the HTTP method, followed by a space followed by the URI of the resource requested, a space, and then the HTTP version. The request line is terminated by a Carriage Return (CR) and a Line Feed (LF) character. Following the request line are the request headers.