Shanti Suresh wrote:
André
Please kindly share the half-page that you have written up so far.
Actually, would you please finish it up and then post?
Well, here you go. Luckily, it was still in my drafts folder.
Remember that it was a draft, and that a more accurate explanation is available in the
Servlet Spec.
A HTTP request looks like this :
GET /the_url.. HTTP/1.1<CR/LF>
Host: somehost.company.com<CR/LF>
..
The "Host:" header is examined first, to find out to which configured Tomcat <Host> this
request is addressed. If a matching Host is found, then this will be the one which
processes this request further. If none is found, then the request will be processed by
Tomcat's default <Host> (the one named in the <Engine> tag).
Then comes the evaluation of the URL ("/the_url..").
Within the selected <Host>, Tomcat will first attempt to match the first part of the URL
with (the path of) one of the (non-ROOT) defined contexts. If a match is found, the
request will be passed to that context for processing (*).
If no match is found, and there is no default context defined, then Tomcat will return an
error to the client.
If there is a default context defined, then Tomcat will pass this request to the default
context (the one under (appBase)/ROOT) for processing. Within that default context, a
match will then be attempted with any of the <url-mapping> elements of that default
context. If a mapping is found, the request will be passed to the corresponding servlet
for processing.
If no mapping is found, the request will be passed to the default servlet of the default
context for processing. That one attempts to find a file on disk within the default
context, which matches the path indicated by the URL. If it finds one, the file will be
returned as the response. If no such file is found, a 404 error will be returned.
(*) within a matching context, there will be further matching of the second part of the
URL, with one the defined servlet's <url-mapping> elements.
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