commit b1c37c9e7b30d0efb5e5ccf8200f2a646b9c36f8
Author: Alex Rousskov <rousskov@measurement-factory.com>
Date:   2021-03-16 11:45:11 -0400

    Limit HeaderLookupTable_t::lookup() to BadHdr and specific IDs

diff --git a/src/http/RegisteredHeaders.cc b/src/http/RegisteredHeaders.cc
index 6b420638e..348a1bb82 100644
--- a/src/http/RegisteredHeaders.cc
+++ b/src/http/RegisteredHeaders.cc
@@ -37,7 +37,7 @@ HeaderTableRecord::HeaderTableRecord(const char *n, HdrType theId, HdrFieldType
 const HeaderTableRecord&
 HeaderLookupTable_t::lookup (const char *buf, const std::size_t len) const {
     const HeaderTableRecord *r = HttpHeaderHashTable::lookup(buf, len);
-    if (!r)
+    if (!r || r->id == Http::HdrType::OTHER)
         return BadHdr;
     return *r;
 }