add X-Accel-Charset to ingored header, fix X-Accel-Buffering

src/http/modules/ngx_http_fastcgi_module.c

diff --git a/src/http/modules/ngx_http_fastcgi_module.c b/src/http/modules/ngx_http_fastcgi_module.c
index a0a328f..b912e19 100644
--- a/src/http/modules/ngx_http_fastcgi_module.c
+++ b/src/http/modules/ngx_http_fastcgi_module.c
@@ -417,7 +417,8 @@
     ngx_string("X-Accel-Expires"),
     ngx_string("X-Accel-Redirect"),
     ngx_string("X-Accel-Limit-Rate"),
-    ngx_string("X-Accel-Buffer"),
+    ngx_string("X-Accel-Buffering"),
+    ngx_string("X-Accel-Charset"),
     ngx_null_string
 };
 

src/http/modules/ngx_http_proxy_module.c

diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index 0849668..d3f4c60 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -435,7 +435,8 @@
     ngx_string("X-Accel-Expires"),
     ngx_string("X-Accel-Redirect"),
     ngx_string("X-Accel-Limit-Rate"),
-    ngx_string("X-Accel-Buffer"),
+    ngx_string("X-Accel-Buffering"),
+    ngx_string("X-Accel-Charset"),
     ngx_null_string
 };