October 2004 - tbnl-devel@common-lisp.net

[tbnl-devel] Handling HTTP errors
by Stefan Scholl 01 Mar '05

01 Mar '05

Hi! Function send-output in modlisp.lisp handles the response for different return codes. E. g. there's a "The requested URL ~A was not found on this server." for the 404 (+http-not-found+). How about letting the user change this behavior? One could explain the error to the user. Maybe in another language. Or think of all the funny 404 games. Remember the SGI babies? There could be different approaches: * Simple hash A hash with error code as key and handler as value. + Easy to implement + Can handle all errors (thrown by handlers _and_ when no dispatcher is found) - Not very flexible. Just checks for the code and not for any request data. * Error dispatcher Like the normal dispatcher, but checking for the right error output handler. + Can handle all errors (thrown by handlers _and_ when no dispatcher is found) + Flexible. Can check the code _and_ request data. - A bit big. The same effort like handling normal requests. * Handler outputs itself and signals that A handler wants to return a 404. It constructs the output string and signals the fact that there's no need for TBNL to build the HTML for the output. + Easy to implement(? clean?) + Flexible - Can't handle all errors. (No handler found? Then the code won't be executed.) Regards, Stefan

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[tbnl-devel] multipart/form-data forms, RFC2388, File Uploads
by Michael Weber 09 Nov '04

09 Nov '04

Hi, Attached is a patch with my stab at file upload capabilities for TBNL. :) [To my defense, I first played around with rfc2388. Then I switched to TBNL and found it to be rather straight-forward to add this functionality. Only afterwards I found out about the efforts of others regarding file uploads for TBNL.] Anyway, here's what the patch is about: * Adds support for multipart/form-data forms. * Can parse rfc2388 MIME data. * Enables file upload. * Introduces POST-PARAMETER* and POST-PARAMETERS* to give richer information about posted data (MIME headers). Also, the starred versions collate parameters with equal name into a list. + If successful, POST-PARAMETER* returns a list of MIME-PARTs, each of which can be further poked at with accessors exported from RFC2388. + POST-PARAMETERS* returns the corresponding hash-table. * Is backwards compatible with original TBNL, although the old interface is less efficiently implemented now (conses more). * Uses a slightly patched rfc2388.lisp (http://common-lisp.net/project/rfc2388) by Janis Dzerins, which is included completely in the patch. * Adds a file upload example to test/test.lisp (sessions.html). It is not very polished, though. Issues: * I tested with SBCL-0.8.15, and occasionally I get Apache "internal server errors" (caused by SIGPIPE errors on the Lisp side). It seems to be dependant on which file is uploaded. I did not look into it yet... * DOES NOT provide functionality to handle transfer encodings. The application is on its own there for now. Mind you, the whole thing is just a first try. Perhaps it needs a better/richer API, too, but this one is simple, and works for me, YMMV. Cheers, Michael p.s.: I noticed, there is at least one other CL rfc2388 implementation available, in mel-base.

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[tbnl-devel] embedding lisp inside html
by Andrew Stebakov 29 Oct '04

29 Oct '04

Hi, I was wondering if it's possible to embed lisp in html the way PHP does? I really want to try switching from PHP to lisp and I have a web site that has a bunch of pages with PHP script (*.php ones). The only examples of lisp I've seen so far were pure lisp scripts that generate html. So, how about a mixture of html and lisp in one page? Thanks in advance. Andrei __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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[tbnl-devel] New version 0.2.12
by Edi Weitz 15 Oct '04

15 Oct '04

Just a minor addition: Version 0.2.12 2004-10-15 Exported and documented DO-SESSIONS Release is at <http://weitz.de/files/tbnl.tgz> Cheers, Edi.

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