On 13 Sep 2004, at 19:18, J. Landman Gay wrote:
Just a little additional information. If you add custom headers to your http requests, these headers will have an environment variable set that matches the header name with "$HTTP_" prepended.On 9/13/04 10:53 AM, Gregory Lypny wrote:
Hello everyone,
Where can I learn about $QUERY_STRING and other variables that are relevant to processing web forms? I noticed that Jacqueline uses this in her Fiction Search example, and my guess is that it returns the values of form fields that have been typed in by users.
Nope, these are HTTP environment variables, set by the server. Not all environment variables are supported by every server; it depends on your ISP and what they allow. Environment variables always start with a dollar sign and are always available; they automatically become global variables when the script starts up. Here is a list of most of them:
<http://www.lib.washington.edu/asp/browser/servar.asp>
So if, for example, you set a custom header like this:
set the httpheaders to "MYACTION: getdata,123x"
The CGI script will have access to an environment variable named $HTTP_MYACTION whose value will be "getdata,123x".
Dave
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