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DOCUMENT_ROOT GATEWAY_INTERFACE HTTP_ACCEPT
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The root document directory for this web server The interface name and version number The formats accepted by the browser This information is optionally supplied by the browser when it first requests the page from the server In our example, the default types accepted include all of the major graphics types (GIF, JPEG, X bitmap), as well as all other MIME types (*/*) The character sets accepted by the browser Any special encoding formats supported by the browser In our example, Netscape supports Gzipencoded documents; they will be decoded on the fly at the time of receipt
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The languages accepted by this browser If supported by the server, then only documents of a specific language will be returned to the browser Any HTTP connection directives A typical directive is Keep-Alive, which forces the server to keep a web-server process and the associated network socket dedicated to this browser until a defined period of inactivity The server host (without domain) The name, version number, and platform of the remote browser In our preceding example output, this was Mozilla (actually Microsoft Internet Explorer) v45b2, for Macintosh PPC Don t be fooled into thinking that the name Mozilla applies only to Netscape Navigator; other browsers, including Microsoft Internet Explorer, also report themselves as being Mozilla browsers this helps with compatibility identification, even though all browsers render HTML differently
HTTP_HOST HTTP_USER_AGENT
Table 18-1
Web Server Environment Variables for CGI Scripts
Perl: The Complete Reference
Environment Variable
PATH CONTENT_LENGTH
Description
The path for the CGI script The length of the query information It s available only for POST requests, and it can help with the security of the scripts you produce The query string, used with GET requests The IP address of the browser The resolved name of the browser The remote port of the browser machine The request method; for example, GET or POST The requested URI (Uniform Resource Identifier) The full path to the CGI script The name of the CGI script The email address of the web-server administrator The fully qualified name of the server The server port number The protocol (usually HTTP) and version number The name and version number of the server software that is being used This can be useful if you want to introduce a single script that makes use of specific features of multiple web servers The time zone of the web server
QUERY_STRING REMOTE_ADDR REMOTE_HOST REMOTE_PORT REQUEST_METHOD REQUEST_URI SCRIPT_FILENAME SCRIPT_NAME SERVER_ADMIN SERVER_NAME SERVER_PORT SERVER_PROTOCOL SERVER_SOFTWARE
TZ Table 18-1
Web Server Environment Variables for CGI Scripts (continued)
print "Content-type: text/html\n\n"; print "<font size=+1>Environment</font><p>\n"; foreach (sort keys %ENV) { print "$_: $ENV{$_}<br>\n"; }
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Developing for the World Wide Web (WWW)
On my web server, which is Apache 1314 running under Solaris 8, the following ends up being displayed within a browser window (Microsoft Internet Explorer for Mac 501):
DOCUMENT_ROOT: /export/http/webs/test GATEWAY_INTERFACE: CGI/11 HTTP_ACCEPT: */* HTTP_ACCEPT_LANGUAGE: en HTTP_CONNECTION: Keep-Alive HTTP_EXTENSION: Security/Remote-Passphrase HTTP_HOST: test HTTP_IF_MODIFIED_SINCE: Tue, 05 Dec 2000 13:48:09 GMT HTTP_UA_CPU: PPC HTTP_UA_OS: MacOS HTTP_USER_AGENT: Mozilla/40 (compatible; MSIE 50; Mac_PowerPC) PATH: /usr/sbin:/usr/bin QUERY_STRING: data=sometestinfo REMOTE_ADDR: 19811210134 REMOTE_PORT: 52566 REQUEST_METHOD: GET REQUEST_URI: /testcgi data=sometestinfo SCRIPT_FILENAME: /export/http/webs/test/testcgi SCRIPT_NAME: /testcgi SERVER_ADDR: 198112101 SERVER_ADMIN: mc@testcom SERVER_NAME: testmchomecom SERVER_PORT: 80 SERVER_PROTOCOL: HTTP/11 SERVER_SIGNATURE: Apache/1314 Server at testmchomecom Port 80 SERVER_SOFTWARE: Apache/1314 (Unix) TZ: GB
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You can glean lots of useful information from this that you can use in your script For example, the SCRIPT_NAME environment variable contains the name of the CGI script that was accessed by the client The most important fields as far as a CGI program are concerned, however, are the REQUEST_METHOD, which defines the method used to transfer the information (request) from the browser, through the web server, to the CGI application The CONTENT_LENGTH defines the number of bytes contained in the query when using the POST method This is useful primarily for verifying that some data has been supplied (and therefore needs processing) The CONTENT_LENGTH
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