ngx_force_gunzip.patch

Summary:
  A simple patch modifying the gunzip filter module to force inflate compressed responses from an upstream source.

Configuration Directives:
  syntax: gunzip_force on|off
  default: off
  context: http, server, location

This Source:
  https://github.com/Jas0n99/ngx_force_gunzip

Original Source:
  http://mailman.nginx.org/pipermail/nginx-devel/2013-January/003276.html

--- src/http/modules/ngx_http_gunzip_filter_module.c
+++ src/http/modules/ngx_http_gunzip_filter_module_NEW.c
@@ -15,6 +15,7 @@
 
 typedef struct {
     ngx_flag_t           enable;
+    ngx_flag_t           force;
     ngx_bufs_t           bufs;
 } ngx_http_gunzip_conf_t;
 
@@ -71,6 +72,13 @@
       offsetof(ngx_http_gunzip_conf_t, enable),
       NULL },
 
+    { ngx_string("gunzip_force"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
+      ngx_conf_set_flag_slot,
+      NGX_HTTP_LOC_CONF_OFFSET,
+      offsetof(ngx_http_gunzip_conf_t, force),
+      NULL },
+
     { ngx_string("gunzip_buffers"),
       NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE2,
       ngx_conf_set_bufs_slot,
@@ -138,6 +146,8 @@
         return ngx_http_next_header_filter(r);
     }
 
+    if (!conf->force) {
+
     r->gzip_vary = 1;
 
     if (!r->gzip_tested) {
@@ -149,6 +159,8 @@
         return ngx_http_next_header_filter(r);
     }
 
+    }
+
     ctx = ngx_pcalloc(r->pool, sizeof(ngx_http_gunzip_ctx_t));
     if (ctx == NULL) {
         return NGX_ERROR;
@@ -654,6 +666,7 @@
      */
 
     conf->enable = NGX_CONF_UNSET;
+    conf->force  = NGX_CONF_UNSET;
 
     return conf;
 }
@@ -666,6 +679,7 @@
     ngx_http_gunzip_conf_t *conf = child;
 
     ngx_conf_merge_value(conf->enable, prev->enable, 0);
+    ngx_conf_merge_value(conf->force, prev->force, 0);
 
     ngx_conf_merge_bufs_value(conf->bufs, prev->bufs,
                               (128 * 1024) / ngx_pagesize, ngx_pagesize);