add lentient flag that probiting multiple host headers or none at all.

Author: Vizonex

src/native/api.c

@@ -324,6 +324,14 @@ void llhttp_set_lenient_header_value_relaxed(llhttp_t* parser, int enabled) {
   }
 }
 
+void llhttp_set_lenient_host_relaxed(llhttp_t* parser, int enabled) {
+  if (enabled) {
+    parser->lenient_flags |= LENIENT_HOST_RELAXED;
+  } else {
+    parser->lenient_flags &= ~LENIENT_HOST_RELAXED;
+  }
+}
+
 /* Callbacks */
 
 

src/native/api.h

@@ -370,6 +370,15 @@ void llhttp_set_lenient_spaces_after_chunk_size(llhttp_t* parser, int enabled);
 LLHTTP_EXPORT
 void llhttp_set_lenient_header_value_relaxed(llhttp_t* parser, int enabled);
 
+
+/* Enables/disables relaxed handling of the host header, which can allow multiple 
+ * or no host headers, when disabled it strictly prohibits these form of requests 
+ * from being accepted.
+ */
+LLHTTP_EXPORT
+void llhttp_set_lenient_host_relaxed(llhttp_t* parser, int enabled);
+
+
 #ifdef __cplusplus
 }  /* extern "C" */
 #endif