diff --git a/test/known_failures_Linux.json b/test/known_failures_Linux.json
index e523085..9d6d54b 100644
--- a/test/known_failures_Linux.json
+++ b/test/known_failures_Linux.json
@@ -83,6 +83,8 @@
   "cpp-py3_compact-accelc_http-ip-ssl",
   "cpp-py3_compact_http-ip",
   "cpp-py3_compact_http-ip-ssl",
+  "cpp-py3_header_http-ip",
+  "cpp-py3_header_http-ip-ssl",
   "cpp-py3_json_http-ip",
   "cpp-py3_json_http-ip-ssl",
   "cpp-py3_multi-accel_http-ip",
@@ -101,6 +103,8 @@
   "cpp-py3_multic-multiac_http-ip-ssl",
   "cpp-py3_multic_http-ip",
   "cpp-py3_multic_http-ip-ssl",
+  "cpp-py3_multih-header_http-ip",
+  "cpp-py3_multih-header_http-ip-ssl",
   "cpp-py3_multij-json_http-ip",
   "cpp-py3_multij-json_http-ip-ssl",
   "cpp-py3_multij_http-ip",
@@ -113,6 +117,8 @@
   "cpp-py_compact-accelc_http-ip-ssl",
   "cpp-py_compact_http-ip",
   "cpp-py_compact_http-ip-ssl",
+  "cpp-py_header_http-ip",
+  "cpp-py_header_http-ip-ssl",
   "cpp-py_json_http-ip",
   "cpp-py_json_http-ip-ssl",
   "cpp-py_multi-accel_http-ip",
@@ -131,6 +137,8 @@
   "cpp-py_multic-multiac_http-ip-ssl",
   "cpp-py_multic_http-ip",
   "cpp-py_multic_http-ip-ssl",
+  "cpp-py_multih-header_http-ip",
+  "cpp-py_multih-header_http-ip-ssl",
   "cpp-py_multij-json_http-ip",
   "cpp-py_multij-json_http-ip-ssl",
   "cpp-py_multij_http-ip",
@@ -375,6 +383,8 @@
   "py-cpp_binary_http-ip-ssl",
   "py-cpp_compact_http-ip",
   "py-cpp_compact_http-ip-ssl",
+  "py-cpp_header_http-ip",
+  "py-cpp_header_http-ip-ssl",
   "py-cpp_json_http-ip",
   "py-cpp_json_http-ip-ssl",
   "py-d_accel-binary_http-ip",
@@ -396,6 +406,7 @@
   "py-hs_accelc-compact_http-ip",
   "py-hs_binary_http-ip",
   "py-hs_compact_http-ip",
+  "py-hs_header_http-ip",
   "py-hs_json_http-ip",
   "py-java_accel-binary_http-ip",
   "py-java_accel-binary_http-ip-ssl",
@@ -420,6 +431,8 @@
   "py3-cpp_binary_http-ip-ssl",
   "py3-cpp_compact_http-ip",
   "py3-cpp_compact_http-ip-ssl",
+  "py3-cpp_header_http-ip",
+  "py3-cpp_header_http-ip-ssl",
   "py3-cpp_json_http-ip",
   "py3-cpp_json_http-ip-ssl",
   "py3-d_accel-binary_http-ip",
@@ -441,6 +454,7 @@
   "py3-hs_accelc-compact_http-ip",
   "py3-hs_binary_http-ip",
   "py3-hs_compact_http-ip",
+  "py3-hs_header_http-ip",
   "py3-hs_json_http-ip",
   "py3-java_accel-binary_http-ip",
   "py3-java_accel-binary_http-ip-ssl",