HTTP in VS .NET

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HTTP
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The Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed hypermedia information systems It is a generic, stateless protocol, which can be used for many tasks beyond its use for hypertext A feature of HTTP is the typing and negotiation of data representation, allowing systems to be built independently of the data being transferred The first version of HTTP, referred to as HTTP/09, was a simple protocol for raw data transfer across the Internet HTTP/10, as defined by RFC 1945 improved the protocol by allowing messages to be in a MIME-like format, containing meta-information about the data transferred and modifiers on the request/response semantics The current version HTTP/11, first defined in RFC 2068 and more recently in RFC 2616, made performance improvements by making all connections persistent and supporting absolute URLs in requests
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URL Request Protocols
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A URL is a pointer to a particular resource on the Internet at a particular location and has a standard format as follows:
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Protocol Servername Filepath
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In order, the three elements are the protocol used to access the server, the name of the server and the location of the resource on the server For example:
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http://wwwmydomaincom/ https://wwwrnydornaincom:8080/ ftp://ftpmydomaincom/exampletxt mailto:me@worldcom file:///c: I Windows/winexe
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Appendix A
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The servername and f ilepath pieces of the URL are totally dependent on where files are stored on your server and what you have called it, but there is a standard collection of protocols, most of which you should be familiar with: Q Q Q Q server Q Q Q Q Q Q file: Loads a file stored on the local (Client) machine It can refer to remote servers but specifies no particular access protocol to remote file systems news : nntp: telnet: gopher: Used to access Usenet newsgroups for articles More sophisticated access to news servers Opens an interactive session with the server A precursor to the World Wide Web http: Normal HTTP requests for documents https : Secure HTTP requests The specific behavior of these depends on the security certificates and encryption keys you have set up JavaScript: Executes JavaScript code within the current document ftp: Retrieves documents from an FTP (File Transfer Protocol)
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mail to: Allows mail to be sent from the browser It may call in assistance from a helper app
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This book exclusively deals with the first five of these
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HTTP Basics
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Each HTTP client (web browser) request and server response has three parts: the request or response line, a header section, and the entity body
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Client Request
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The client initiates a web page transaction - client page request and server page response - as follows The client connects to an HTTP-based server at a designated port (by default, 80) and sends a request by specifying an HTTP command called a method, followed by a document address, and an HTTP version number The format of the request line is:
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Method Request-URI Protocol
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For example:
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GET /indexhtml HTTP/10
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uses the GET method to request the document /indexhtml using version 10 of the protocol We'll come to a full list of HTTP Request Methods later Next, the client sends optional header information to the server about its configuration and the document formats it will accept All header information is sent line by line, each with a header name and value in the form:
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HTTP
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Keyword: For example:
Value
User-Agent: Accept:
Lynx/24 libwww/51k image/gif, image/x-xbitmap,
image/jpeg,
The request line and the subsequent header lines are each terminated by a carriage return/linefeed (\r\n) sequence The client sends a blank line to end the headers We'll return with a full description of each HTTP Header value later on in the Appendix Finally, after sending the request and headers the client may send additional data This data is mostly used by CGI programs using the POST method This additional information is called a request entity Finally a blank line (\r\n\r\n) terminates the request A complete request might look like the following: