diff -up http-parser-2.7.1/http_parser.c.cve http-parser-2.7.1/http_parser.c
--- http-parser-2.7.1/http_parser.c.cve	2019-03-22 22:33:28.577238523 +0100
+++ http-parser-2.7.1/http_parser.c	2019-03-22 22:35:12.237323250 +0100
@@ -29,6 +29,8 @@
 #include <string.h>
 #include <limits.h>
 
+static uint32_t max_header_size = HTTP_MAX_HEADER_SIZE;
+
 #ifndef ULLONG_MAX
 # define ULLONG_MAX ((uint64_t) -1) /* 2^64-1 */
 #endif
@@ -141,20 +143,20 @@ do {
 } while (0)
 
 /* Don't allow the total size of the HTTP headers (including the status
- * line) to exceed HTTP_MAX_HEADER_SIZE.  This check is here to protect
+ * line) to exceed max_header_size.  This check is here to protect
  * embedders against denial-of-service attacks where the attacker feeds
  * us a never-ending header that the embedder keeps buffering.
  *
  * This check is arguably the responsibility of embedders but we're doing
  * it on the embedder's behalf because most won't bother and this way we
- * make the web a little safer.  HTTP_MAX_HEADER_SIZE is still far bigger
+ * make the web a little safer.  max_header_size is still far bigger
  * than any reasonable request or response so this should never affect
  * day-to-day operation.
  */
 #define COUNT_HEADER_SIZE(V)                                         \
 do {                                                                 \
   parser->nread += (V);                                              \
-  if (UNLIKELY(parser->nread > (HTTP_MAX_HEADER_SIZE))) {            \
+  if (UNLIKELY(parser->nread > (max_header_size))) {                 \
     SET_ERRNO(HPE_HEADER_OVERFLOW);                                  \
     goto error;                                                      \
   }                                                                  \
@@ -1538,7 +1540,7 @@ reexecute:
               const char* p_lf;
               size_t limit = data + len - p;
 
-              limit = MIN(limit, HTTP_MAX_HEADER_SIZE);
+              limit = MIN(limit, max_header_size);
 
               p_cr = (const char*) memchr(p, CR, limit);
               p_lf = (const char*) memchr(p, LF, limit);
@@ -2468,3 +2470,8 @@ http_parser_version(void) {
          HTTP_PARSER_VERSION_MINOR * 0x00100 |
          HTTP_PARSER_VERSION_PATCH * 0x00001;
 }
+
+void
+http_parser_set_max_header_size(uint32_t size) {
+  max_header_size = size;
+}
diff -up http-parser-2.7.1/http_parser.h.cve http-parser-2.7.1/http_parser.h
--- http-parser-2.7.1/http_parser.h.cve	2019-03-22 22:33:37.133245016 +0100
+++ http-parser-2.7.1/http_parser.h	2019-03-22 22:34:03.640265140 +0100
@@ -426,6 +426,9 @@ void http_parser_pause(http_parser *pars
 /* Checks if this is the final chunk of the body. */
 int http_body_is_final(const http_parser *parser);
 
+/* Change the maximum header size provided at compile time. */
+void http_parser_set_max_header_size(uint32_t size);
+
 #ifdef __cplusplus
 }
 #endif