feature: ngx_http_lua_ffi_set_resp_header(): now add an override flag argument to control whether to override existing resp headers.

this feature is required by the new ngx.resp module's add_header() Lua API (in lua-resty-core).

thanks spacewander for the patch.

Signed-off-by: Yichun Zhang (agentzh) <agentzh@gmail.com>

Author: agentzh

src/ngx_http_lua_headers.c

@@ -1166,7 +1166,8 @@ ngx_http_lua_ffi_req_get_headers(ngx_http_request_t *r,
 int
 ngx_http_lua_ffi_set_resp_header(ngx_http_request_t *r, const u_char *key_data,
     size_t key_len, int is_nil, const u_char *sval, size_t sval_len,
-    ngx_http_lua_ffi_str_t *mvals, size_t mvals_len, char **errmsg)
+    ngx_http_lua_ffi_str_t *mvals, size_t mvals_len, int override,
+    char **errmsg)
 {
     u_char                      *p;
     ngx_str_t                    value, key;
@@ -1249,7 +1250,7 @@ ngx_http_lua_ffi_set_resp_header(ngx_http_request_t *r, const u_char *key_data,
                 value.len = len;
 
                 rc = ngx_http_lua_set_output_header(r, key, value,
-                                                    i == 0 /* override */);
+                                                    override && i == 0);
 
                 if (rc == NGX_ERROR) {
                     *errmsg = "failed to set header";
@@ -1274,7 +1275,7 @@ ngx_http_lua_ffi_set_resp_header(ngx_http_request_t *r, const u_char *key_data,
     dd("key: %.*s, value: %.*s",
        (int) key.len, key.data, (int) value.len, value.data);
 
-    rc = ngx_http_lua_set_output_header(r, key, value, 1 /* override */);
+    rc = ngx_http_lua_set_output_header(r, key, value, override);
 
     if (rc == NGX_ERROR) {
         *errmsg = "failed to set header";