nginx日志支持中文URL显示的补丁

nginx-url-unescape.patch

diff -Nur nginx-1.12.1/src/http/ngx_http_request.c nginx-1.12.1-unescape/src/http/ngx_http_request.c
--- nginx-1.12.1/src/http/ngx_http_request.c	2017-07-11 21:24:09.000000000 +0800
+++ nginx-1.12.1-unescape/src/http/ngx_http_request.c	2017-07-19 12:35:57.345284961 +0800
@@ -924,6 +924,13 @@
     ngx_str_t            host;
     ngx_connection_t    *c;
     ngx_http_request_t  *r;
+    /* 允许取消转义的最大URL长度  */
+    #define ALLOW_LEN 512
+    char tmp[ALLOW_LEN] = {0};
+    char* tmp_p = &tmp;
+    int old_len, new_len;
+    u_char* url_start_pos;
+    char* url_end_pos;
 
     c = rev->data;
     r = c->data;
@@ -950,6 +957,19 @@
             }
         }
 
+        url_end_pos = strstr((char*)r->header_in->start, " HTTP/1.1");
+        old_len = url_end_pos - (char*)r->header_in->start;
+        if (url_end_pos && old_len <= ALLOW_LEN) {
+            url_start_pos = r->header_in->start;
+            ngx_unescape_uri(&tmp_p, &url_start_pos, old_len, 0);
+            new_len = strlen(tmp);
+            if (new_len != old_len) {
+                r->header_in->start = r->header_in->start + (old_len - new_len);
+                r->header_in->pos = r->header_in->start;
+                memcpy(r->header_in->start, tmp, new_len);
+            }
+        }
+
         rc = ngx_http_parse_request_line(r, r->header_in);
 
         if (rc == NGX_OK) {