From: "Greg Ames" <[EMAIL PROTECTED]> Sent: Thursday, December 13, 2001 1:55 PM
> "William A. Rowe, Jr." wrote: > > > Second, autoindex should be a generator [handler]. mod_dir should _NOT_. I >spelled > > out the reasons for that on 2001.12.02. > > OK, peace. But since we were talking about how to drive handlers more > efficiently, we need to think about the harder cases. One of them will > be how to deal with multiple handlers who will accept the same > r->handler value. :) We have a number of cases like this. I'd believe that the simplest way to handle them is to address the handler first in the translation phase (if the request maps to a non-filesystem uri) or then in the type checker or fixup based on the content (which is what the old system did 90% of the time anyways.) Let's look at the full list of Apache handlers; default_handler The fallback case, assigned in fixups if nobody else gloms onto a filesystem request (where r->finfo.filetype != NULL). Or it could be the product of handler_fn != NULL, and left at that. file_cache_handler, handle_map_file Are identified in the translate_names phase (file found) and could be overridden with SetHandler/AddHandler in the type-checker phase. Not really a generator, but these are alternates to the default (plain file) cases. isapi_handler, cgi_handler, cgid_handler, asis_handler, imap_handler These can be claimed in the type-checker phase (SetHandler/AddHandler or by-content-type.) All of these are truly handlers because they do very unique things with otherwise plain files. display_info, status_handler Are identified by the location_walk phase (SetHandler or error condition) and really are generators. ssl_hook_Handler A generator I suspect doesn't need to be, we should be allowed to error out earlier. If this is not possible, it's easily identified very early on. [Just an "It's Broke, don't send plain requests on an SSL port!" response.] autoindex_handler Can be claimed in the fixups phase if nobody else claims it, it is really a generator. dir_handler, redirect_handler We shouldn't have to get this far, we should be able to return the redirect back in the fixups phase, as I've proposed for mod_dir. This allows us to print some pretty href in the autoindex listing that would save us a roundtrip from the client, potentially. proxy_handler Which is a real handler, and is easily identified up front, at least by the fixups phase even on internal proxy redirection. action_handler A really tricky little beast, no? If you want one to debate, here it is :) So there's the recap. I assert that we can decide exactly which handler aught to take a request no later than the fixups phase. Comments? Bill
