C # Implementation Web server

This is just a simple use of C # written Web server, only to achieve the get way of the request for HTML files, interested friends can continue to develop more features on this basis, little Brother Learning C # soon, if there are errors and omissions, hope to see cool!!
Summary:
The work of WWW is based on the client/server computing model, consisting of a Web browser (client) and a Web server (server), which uses Hypertext Transfer Protocol (HTTP) to communicate, and the principle of HTTP protocol includes four steps: connection, request, reply. According to the principle of the HTTP protocol mentioned above, this paper realizes the method of Web server program of Get request by creating TcpListener class object, listening port 8080, waiting, accepting client connecting to port 8080, creating input stream and output stream associated with socket word; Reads the client's request information, if the request type is get, obtains the access HTML file name from the request information, if the HTML file exists, opens the HTML file, returns the HTTP header information and the HTML file contents to the Web browser via the socket, and then closes the file. Otherwise, send an error message to the Web browser. Finally, close the socket word that is connected to the appropriate Web browser.
The function principle of HTTP protocol
WWW is an application system with Internet as transmission medium, the most basic transmission unit of WWW is Web page. The work of WWW is based on the client/server computing model, consisting of a Web browser (client) and a Web server (server), which communicates with a Hypertext Transfer Protocol (HTTP). The HTTP protocol, which is based on TCP/IP protocol, is an application layer protocol between Web browsers and Web servers, and is a universal, stateless, object-oriented protocol. The principle of the HTTP protocol includes four steps:
Connection: The Web browser establishes a connection to the Web server, opens a virtual file called a socket (socket), which marks the successful connection establishment.
Request: The Web browser submits the request to the Web server via the socket. HTTP requests are typically a GET or post command (the post is used for the pass of form parameters). The format of the Get command is:
Get path/filename http/1.0
The filename indicates the file being accessed, and http/1.0 indicates the HTTP version used by the Web browser.
Answer: When a Web browser submits a request, it is routed to the Web server via the HTTP protocol. When the Web server receives the transaction, the processing results are returned to the Web browser via HTTP, which displays the requested page in the Web browser.
For example: Assuming the client has established a connection with www.mycomputer.com:8080/mydir/index.html, the Get command is sent: Get/mydir/index.html http/1.0. A Web server with host name www.mycomputer.com searches its document space for Mydir file index.html of subdirectories. If the file is found, the Web server transmits the contents of the file to the appropriate Web browser.
To tell the Web browser what type of content to transfer, the Web server first transmits some HTTP header information and then transmits the specific content (that is, the HTTP body information), separating the HTTP header information from the HTTP body information with a blank line.