Viewing all Server Variables for a Site
I often do development, testing or troubleshooting where I want to see all server variables available to a site. For example, when using a reverse proxy for load balancing, SERVER_ADDR, HTTP_HOST and other variables can change.
Whenever I run into that situation, I write out a simple script that displays all server variables. I thought I would share it here.
Create a file on your server called serversvariables.aspx, test.aspx or whatever you want to call it. Place the following in it:
For Each var as String in Request.ServerVariables
Response.Write(var & " " & Request(var) & "<br>")
Next
Or if you prefer C#, use the following:
<% @ Page Language="C#" %>
<%
foreach (string var in Request.ServerVariables)
{
Response.Write(var + " " + Request[var] + "<br>");
}
Then simply call the page from a web browser and it will list all server variables.
The top two variables are worth noting. They are ALL_HTTP and ALL_RAW which contain all server variables and are repeated with the specific server variables. Since they contain everything, they can clutter up the page. You can wrap the Response.Write line in an ‘if’ condition to exclude ALL_HTTP and ALL_RAW if you want, but I find for a quick testing page, I don’t bother, and it gives me every server variable.
The output will look something like this:
{ALL_HTTP and ALL_RAW have been removed from this example.}
APPL_MD_PATH: /LM/W3SVC/2/ROOT
APPL_PHYSICAL_PATH: C:\domains\example.com\
AUTH_TYPE: Forms
AUTH_USER: Scott
AUTH_PASSWORD:
LOGON_USER: Scott
REMOTE_USER: Scott
CERT_COOKIE:
CERT_FLAGS:
CERT_ISSUER:
CERT_KEYSIZE:
CERT_SECRETKEYSIZE:
CERT_SERIALNUMBER:
CERT_SERVER_ISSUER:
CERT_SERVER_SUBJECT:
CERT_SUBJECT:
CONTENT_LENGTH: 0
CONTENT_TYPE:
GATEWAY_INTERFACE: CGI/1.1
HTTPS: off
HTTPS_KEYSIZE:
HTTPS_SECRETKEYSIZE:
HTTPS_SERVER_ISSUER:
HTTPS_SERVER_SUBJECT:
INSTANCE_ID: 2
INSTANCE_META_PATH: /LM/W3SVC/2
LOCAL_ADDR: 206.72.119.72
PATH_INFO: /ServerVariables.aspx
PATH_TRANSLATED: C:\domains\example.com\ServerVariables.aspx
QUERY_STRING:
REMOTE_ADDR: 192.168.168.29
REMOTE_HOST: 192.168.168.29
REMOTE_PORT: 60137
REQUEST_METHOD: GET
SCRIPT_NAME: /ServerVariables.aspx
SERVER_NAME: www.example.com
SERVER_PORT: 80
SERVER_PORT_SECURE: 0
SERVER_PROTOCOL: HTTP/1.1
SERVER_SOFTWARE: Microsoft-IIS/7.5
URL: /ServerVariables.aspx
HTTP_CACHE_CONTROL: max-age=0
HTTP_CONNECTION: Keep-Alive
HTTP_ACCEPT: application/xml,application/xhtml+xml,text/html;q=0.9...HTTP_ACCEPT_CHARSET: ISO-8859-1,utf-8;q=0.7,*;q=0.3
HTTP_ACCEPT_ENCODING: gzip,deflate,sdch
HTTP_ACCEPT_LANGUAGE: en-US,en;q=0.8
HTTP_COOKIE: {removed}
HTTP_HOST: www.example.com
HTTP_MAX_FORWARDS: 10
HTTP_USER_AGENT: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) ...HTTP_X_ORIGINAL_HOST: www.example.com
HTTP_X_ORIGINAL_SERVER_PORT: 80
HTTP_X_ORIGINAL_URL: /ServerVariables.aspx
HTTP_X_FORWARDED_FOR: 192.168.168.29:60137
HTTP_X_ARR_LOG_ID: 3dc509e5-5da8-4b6b-91ee-f084c308e2ce
HTTP_X_SITE_INSTANCE: 01
Hope you find this useful. Happy coding / troubleshooting!