nginx 0.7.18 *) Change: the "underscores_in_headers" directive; now nginx does not allows underscores in a client request header line names. *) Feature: the ngx_http_secure_link_module. *) Feature: the "real_ip_header" directive supports any header. *) Feature: the "log_subrequest" directive. *) Feature: the $realpath_root variable. *) Feature: the "http_502" and "http_504" parameters of the "proxy_next_upstream" directive. *) Bugfix: the "http_503" parameter of the "proxy_next_upstream" or "fastcgi_next_upstream" directives did not work. *) Bugfix: nginx might send a "Transfer-Encoding: chunked" heaer line for HEAD requests. *) Bugfix: now accept threshold depends on worker_connections.

--- a/src/http/ngx_http.h
+++ b/src/http/ngx_http.h
@@ -72,7 +72,8 @@ ngx_int_t ngx_http_parse_complex_uri(ngx
     ngx_uint_t merge_slashes);
 ngx_int_t ngx_http_parse_unsafe_uri(ngx_http_request_t *r, ngx_str_t *uri,
     ngx_str_t *args, ngx_uint_t *flags);
-ngx_int_t ngx_http_parse_header_line(ngx_http_request_t *r, ngx_buf_t *b);
+ngx_int_t ngx_http_parse_header_line(ngx_http_request_t *r, ngx_buf_t *b,
+    ngx_uint_t allow_underscores);
 ngx_int_t ngx_http_parse_multi_header_lines(ngx_array_t *headers,
     ngx_str_t *name, ngx_str_t *value);