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The header lines recieved from the client, if any, are placed into the environment with the prefix HTTP_ followed by the header name. These variables are specific to requests made with HTTP. Interpretation of these variables may depend on the value of SERVER_PROTOCOL.

The HTTP header name

• is converted to upper case;
• "-" characters are changed to "_" characters;
• has "HTTP_" prepended to give the environment variable name.

The server must, if necessary, change the representation of the data (for example, the character set) to be appropriate for a CGI environment variable.

The server is not required to create environment variables for all the headers that it receives. It may exclude any headers which it has already processed, such as Authorization, Content-type, and Content-length. In particular, it may remove any headers carrying authentication information, such as "Authorization"; it may remove headers whose value is available to the script via other variables, such as "Content-Length" and "Content-Type".

If necessary, the server may choose to exclude any or all of these headers if including them would exceed any system environment limits.

A couple of the often-used headers are:-

• HTTP_REFERER
  The URL of the refering page, i.e. the page that the client is following the link from.

• HTTP_USER_AGENT
  The browser the client is using to send the request. General format: software/version library/version.