Bugfix/nginx unbuffered bug (#2638)

Author: CamJN

.clangd

@@ -2,5 +2,5 @@ CompileFlags:
   Add:
     - -xc++-header
     - -DINTELLISENSE
-    - -std=gnu++11
+    - -std=gnu++14
     - -ferror-limit=0

CHANGELOG

@@ -3,6 +3,7 @@ Release 6.1.1 (Not yet released)
  * [Ruby] Improve support for Ruby 4 and Frozen String Literals. Closes GH-2619.
  * [Ubuntu] Add packages for Ubuntu 25.10 "questing", remove packages for Ubuntu 25.04 "plucky".
  * Upgrade Boost from 1.87 -> 1.89.
+ * [Nginx] Fixes bug with unbuffered uploads. Closes GH-2575.
  * [Nginx] Upgrades preferred Nginx to 1.28.0 from 1.26.3.
  * [Nginx] The preferred PCRE2 version is now 10.46 (previously 10.45).
  * Updated various library versions used in precompiled binaries (used for e.g. gem installs):

src/nginx_module/ContentHandler.c

@@ -1058,6 +1058,7 @@ create_request(ngx_http_request_t *r)
     body = r->upstream->request_bufs;
     r->upstream->request_bufs = cl;
 
+    if (!r->request_body_no_buffering) {
     while (body) {
         if (r->headers_in.chunked && r->request_body_no_buffering) {
             /* If Transfer-Encoding is chunked, then Nginx dechunks the body.
@@ -1113,6 +1114,7 @@ create_request(ngx_http_request_t *r)
             cl->buf = b;
         }
     }
+    }
 
     b->flush = 1;
     cl->next = NULL;