[nginx] Gzip static: ranges support (ticket #2349).

[Sergey Kandaurov]

details:   https://hg.nginx.org/nginx/rev/c7e103acb409
branches:  
changeset: 8120:c7e103acb409
user:      Maxim Dounin <mdounin at mdounin.ru>
date:      Tue Jan 24 03:01:51 2023 +0300
description:
Gzip static: ranges support (ticket #2349).

In contrast to on-the-fly gzipping with gzip filter, static gzipped
representation as returned by gzip_static is persistent, and therefore
the same binary representation is available for future requests, making
it possible to use range requests.

Further, if a gzipped representation is re-generated with different
compression settings, it is expected to result in different ETag and
different size reported in the Content-Range header, making it possible
to safely use range requests anyway.

As such, ranges are now allowed for files returned by gzip_static.

diffstat:

 src/http/modules/ngx_http_gzip_static_module.c |  2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diffs (12 lines):

diff -r ec26874c3f60 -r c7e103acb409 src/http/modules/ngx_http_gzip_static_module.c
--- a/src/http/modules/ngx_http_gzip_static_module.c	Mon Jan 23 05:01:01 2023 +0300
+++ b/src/http/modules/ngx_http_gzip_static_module.c	Tue Jan 24 03:01:51 2023 +0300
@@ -247,6 +247,8 @@ ngx_http_gzip_static_handler(ngx_http_re
     ngx_str_set(&h->value, "gzip");
     r->headers_out.content_encoding = h;
 
+    r->allow_ranges = 1;
+
     /* we need to allocate all before the header would be sent */
 
     b = ngx_calloc_buf(r->pool);