Allowed digits, '+', '-', and '.' in scheme names as per RFC 3986.

src/http/ngx_http_parse.c

@@ -307,6 +307,11 @@ ngx_http_parse_request_line(ngx_http_request_t *r, ngx_buf_t *b)
                 break;
             }
 
+            if ((ch >= '0' && ch <= '9') || ch == '+' || ch == '-' || ch == '.')
+            {
+                break;
+            }
+
             switch (ch) {
             case ':':
                 r->schema_end = p;