HTTP Headers in Visual Studio .NET

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HTTP Headers
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These headers can appear in requests or responses Some control how the web server behaves, others are meant for proxy servers and some will affect what your browser does with a response when it is received You should refer to the HTTP 11 specification for a full description You can download it from:
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ftp://ftpisiedu/in-notes/rfc2616txt
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The authentication is covered in a little more detail in:
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ftp://ftpisiedu/in-notes/rfc2617txt
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Other RFC documents from the same source may be useful and provide additional insights This table summarizes the headers you'll find most helpful There are others in the specification but they control how the web server manages the requests and won't arrive in the CGI environment for you to access: Header Accept: Accept-Charset : Accept-Encoding : Request
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Response
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Description Lists the types that the client can cope with Lists the character sets that the browser can cope with List of acceptable encodings or none Omitting this header signifies that all current encodings are acceptable List of acceptable languages
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Table Continued on Following Page
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Accept -Language :
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Appendix A
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Header
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Age : Allow:
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Request
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Response
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Description A cache control header used to indicate the age of a response body Determines the available methods that the resource identified by the URI can respond to Authorization credentials Refer to RFC 2617 for more information on Digest authentication
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Authorization:
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Cache-Control :
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A sophisticated proxy-controlling header Can be used to describe how proxies should handle requests and responses Defines an encoding for the body data This would normally be Base64
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Code: Content-Base:
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Used to resolve relative URLs within the body of the document being returned It overrides the value in the Content-Location header Specifies encodings that have been applied to the body prior to transmission This specifies the natural language of the response content The length of the body measured in bytes should be put here CGI responses may defer to the web server and allow it to put this header in The actual location of the entity being returned in the response This may be useful when deploying resources that can be resolved in several ways The specifically selected version can be identified and requested directly This is a way of computing a checksum for the entity body The receiving browser can compare its computed value to be sure that the body has not been modified during transmission
Content-Encoding :
Content-Language : Content-Length :
/
Content -Location:
Content-MD5 :
HTTP
Header Content -Type:
Request
Response
Description The type of data being returned in the response is specified with this header These types are listed later in this appendix The date after which the response should be considered to be stale The client e-mail address is sent in this header The target virtual host is defined in this header The value is taken from the originating URL when the request is made
Expires:
From:
Host:
Last-Modified:
This indicates when the content being returned was last modified For static files, the web server would use the file's timestamp For a dynamically generated page, you might prefer to insert a value based on when a database entry was last changed Other more sophisticated cache control headers are provided in the HTTP specification Refer to RFC 2616 for details Used to redirect to a new location This could be used as part of a smart error handling CGI The source of the current request is indicated here This would be the page that the request was linked from You can determine whether the link was from outside your site and also pick up search engine parameters from this too, if your URJ was requested via Yahoo, for example This is the signature field of the browser You can code round limitations in browsers if you know this Be aware of some of the weird values that can show up in this header now that developers are building their own web browsers and spiders
Location:
Referrer :
User-Agent :
Warning:
This is used to carry additional information about the response and whether there are risks associated with it