Disable local 100 continue response, proxy it from upstream

nginx-proxy-100-continue.patch

diff -r -u nginx-1.10.3.orig/src/http/ngx_http_core_module.c nginx-1.10.3/src/http/ngx_http_core_module.c
--- nginx-1.10.3.orig/src/http/ngx_http_core_module.c	2017-01-31 18:01:11.000000000 +0300
+++ nginx-1.10.3/src/http/ngx_http_core_module.c	2017-02-13 15:37:11.505036520 +0300
@@ -626,6 +626,13 @@
       offsetof(ngx_http_core_loc_conf_t, etag),
       NULL },
 
+    { ngx_string("proxy_100_continue"),
+      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_core_loc_conf_t, proxy_100_continue),
+      NULL },
+
     { ngx_string("error_page"),
       NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF
                         |NGX_CONF_2MORE,
@@ -3647,6 +3654,7 @@
     clcf->server_tokens = NGX_CONF_UNSET;
     clcf->chunked_transfer_encoding = NGX_CONF_UNSET;
     clcf->etag = NGX_CONF_UNSET;
+	clcf->proxy_100_continue = NGX_CONF_UNSET;
     clcf->types_hash_max_size = NGX_CONF_UNSET_UINT;
     clcf->types_hash_bucket_size = NGX_CONF_UNSET_UINT;
 
@@ -3914,6 +3922,7 @@
     ngx_conf_merge_value(conf->chunked_transfer_encoding,
                               prev->chunked_transfer_encoding, 1);
     ngx_conf_merge_value(conf->etag, prev->etag, 1);
+    ngx_conf_merge_value(conf->proxy_100_continue, prev->proxy_100_continue, 0);
 
     ngx_conf_merge_ptr_value(conf->open_file_cache,
                               prev->open_file_cache, NULL);
diff -r -u nginx-1.10.3.orig/src/http/ngx_http_core_module.h nginx-1.10.3/src/http/ngx_http_core_module.h
--- nginx-1.10.3.orig/src/http/ngx_http_core_module.h	2017-01-31 18:01:11.000000000 +0300
+++ nginx-1.10.3/src/http/ngx_http_core_module.h	2017-02-13 15:35:13.468039254 +0300
@@ -418,6 +418,7 @@
     ngx_flag_t    server_tokens;           /* server_tokens */
     ngx_flag_t    chunked_transfer_encoding; /* chunked_transfer_encoding */
     ngx_flag_t    etag;                    /* etag */
+    ngx_flag_t    proxy_100_continue;      /* proxy_100_continue to upstream */
 
 #if (NGX_HTTP_GZIP)
     ngx_flag_t    gzip_vary;               /* gzip_vary */
diff -r -u nginx-1.10.3.orig/src/http/ngx_http_request_body.c nginx-1.10.3/src/http/ngx_http_request_body.c
--- nginx-1.10.3.orig/src/http/ngx_http_request_body.c	2017-01-31 18:01:11.000000000 +0300
+++ nginx-1.10.3/src/http/ngx_http_request_body.c	2017-02-13 15:38:17.910034981 +0300
@@ -53,10 +53,18 @@
     }
 #endif
 
-    if (ngx_http_test_expect(r) != NGX_OK) {
-        rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
-        goto done;
-    }
+	clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
+
+	if (clcf->proxy_100_continue) {
+
+		r->expect_tested = 1;
+
+	} else {
+		if (ngx_http_test_expect(r) != NGX_OK) {
+			rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
+			goto done;
+		}
+	}
 
     rb = ngx_pcalloc(r->pool, sizeof(ngx_http_request_body_t));
     if (rb == NULL) {
@@ -155,8 +163,6 @@
         goto done;
     }
 
-    clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
-
     size = clcf->client_body_buffer_size;
     size += size >> 2;