having trouble reading header values in classic ASP

Question

This is all internal servers and software, so I\'m very limited on my options, but this is where I\'m at. This is already a band-aid to a workaround but I have no choice, s

Answer 1

For the sake of expedience, why not just parse Request.ServerVariables("ALL_RAW") yourself?

Answer 2

I found my answer.

When I ran this loop

<%
for each x in Request.ServerVariables
  response.write("<B>" & x & ":</b> " & Request.ServerVariables(x) & "<p />")
next
%>

it would return a list of all the names that were in the header and their values. The custom value I was looking for would show as name "HTTP_CUSTOM_ID" and I could see it, with it's value in the ALL_HTTP and ALL_RAW, but when I tried to pull that specific value, it would return an empty string. The solution I stumbled on (by talking to someone else here at work who had gone through a similar situation with the same service I was trying to accommodate is to use:

<%=Request.ServerVariables("HEADER_CUSTOM_ID")%>

When viewing the full header, nothing led me to use the HEADER prefix instead of the HTTP, in fact, it led me opposite. And I never found any mention of this anywhere searching online either. So I'm posting my own answer to my question here so it is on the web.

Answer 3

There is a better way than parsing each item yourself. Look at the values in Request.ServerVariables("ALL_HTTP") and find the header you need but named a bit different.

All HTTP headers start with HTTP_. I was looking for If-None-Match and it was in the collection as HTTP_IF_NONE_MATCH. To get the value I used Request.ServerVariables("HTTP_IF_NONE_MATCH").