On Tue, Jan 09, 2018 at 05:38:57PM +0100, Hidvégi Gábor wrote:
> >Synopsis: httpd reports wrong mimetype when item is in the browser cache
> >Category: httpd
> >Environment:
> System : OpenBSD 6.2
> Details : OpenBSD 6.2 (GENERIC) #91: Wed Oct 4 00:35:21 MDT
> 2017
>
> [email protected]:/usr/src/sys/arch/armv7/compile/GENERIC
>
> Architecture: OpenBSD.armv7
> Machine : armv7
> >Description:
>
> httpd serves static files (eg. images) with Last-Modified http header. When
> a browser next time asks whether this file changed (sends If-Modified-Since
> http header) httpd responds with wrong mimetype, 'text/html' when the
> resource is in the browser cache (304 Not Modified status code).
>
> >How-To-Repeat:
>
> This bug is common, not arm only. When for example you open this image:
> https://man.openbsd.org/openbsd.gif
>
> in a browser with developer tools (F12) open, on the network tab you can
> take a look at the response headers, mimetype is correct (image/gif). After
> opening press refresh (F5) and look at the response headers again, and you
> get the incorrect mimetype, 'text/html'.
>
> >Fix:
>
> check httpd source
Please try out this diff, it makes sure to set the correct MIME-type and
not respond with a body if the resource has not changed. Sending this to
tech@ as well.
Index: server_file.c
===================================================================
RCS file: /cvs/src/usr.sbin/httpd/server_file.c,v
retrieving revision 1.65
diff -u -p -r1.65 server_file.c
--- server_file.c 2 Feb 2017 22:19:59 -0000 1.65
+++ server_file.c 12 Jan 2018 19:10:20 -0000
@@ -230,8 +230,15 @@ server_file_request(struct httpd *env, s
goto abort;
}
- if ((ret = server_file_modified_since(clt->clt_descreq, st)) != -1)
- return (ret);
+ if (server_file_modified_since(clt->clt_descreq, st) == 0) {
+ media = media_find_config(env, srv_conf, path);
+ ret = server_response_http(clt, 304, media, 0,
+ st->st_mtim.tv_sec);
+ if (ret != -1)
+ goto done;
+ else
+ goto fail;
+ }
/* Now open the file, should be readable or we have another problem */
if ((fd = open(path, O_RDONLY)) == -1)
@@ -663,10 +670,10 @@ server_file_modified_since(struct http_d
if (strptime(since->kv_value,
"%a, %d %h %Y %T %Z", &tm) != NULL &&
timegm(&tm) >= st->st_mtim.tv_sec)
- return (304);
+ return (0);
}
- return (-1);
+ return (1);
}
int
