Re: bin/58880: bozohttpd(8): set custom header field in responses

["Sunil Nimmagadda via gnats" <gnats-admin%NetBSD.org@localhost>]

The following reply was made to PR bin/58880; it has been noted by GNATS.

From: Sunil Nimmagadda <sunil%nimmagadda.net@localhost>
To: Martin Husemann <martin%duskware.de@localhost>
Cc: gnats-bugs%netbsd.org@localhost,  mrg%netbsd.org@localhost,  gnats-admin%netbsd.org@localhost,
  netbsd-bugs%netbsd.org@localhost,  campbell+netbsd%mumble.net@localhost
Subject: Re: bin/58880: bozohttpd(8): set custom header field in responses
Date: Fri, 13 Dec 2024 18:26:25 +0530

 Martin Husemann <martin%duskware.de@localhost> writes:
 
 > Just a tangential node:
 >
 >  - if we always want to send all headers verbatim, it would be simpler to
 >    create a single malloc() for the whole header file and make sure it has
 >    no empty lines in it when reading, then just write it out in one
 >    call. Gets rid of the simpleque and the iterations.
 
 It's a nice idea except that the line delimiter mismatch ("\n" vs "\r\n")
 between the file and HTTP headers will require fragmenting it anyway.
 
 >
 >  - if we consider doing value replacements later (not sure if that could
 >    be usefull and what values to offer in that context) it would be easier
 >    if we would parse the file into header and value pairs, unwrap continuation
 >    lines and have them in a struct with header/value pointer on the simpleque.
 >
 > Do other servers offer some kind of right-hand-side (value) string 
 > substitutions for this?
 
 Checked nginx[0], apache[1] and they do allow value substitutions.
 
 On Jan 3, 2016, elric introduced the concept of reply headers[2] but I
 couldn't see any code populating them. If we intend to support value
 substitutions, I guess it's a good idea to tokenize the custom headers
 from .bzcustomheaders file and use hr_replheaders.
 
 [0] http://nginx.org/en/docs/http/ngx_http_headers_module.html
 [1] https://httpd.apache.org/docs/2.4/mod/mod_headers.html
 [2] http://cvsweb.netbsd.org/bsdweb.cgi/src/libexec/httpd/bozohttpd.c.diff?r1=1.77;r2=1.78