diff --git a/tx/test-cases.json b/tx/test-cases.json
index 29ce922c..46aeb538 100644
--- a/tx/test-cases.json
+++ b/tx/test-cases.json
@@ -304,19 +304,19 @@
       },{
         "name" : "language-echo-en-en-header",
         "operation" : "expand",
-        "Content-Language" : "en",
+        "Accept-Language" : "en",
         "request" : "language/expand-echo-en-en-header-request-parameters.json",
         "response" : "language/expand-echo-en-en-header-response-valueSet.json"
       },{
         "name" : "language-echo-en-en-vslang",
         "operation" : "expand",
-        "Content-Language" : "en",
+        "Accept-Language" : "en",
         "request" : "language/expand-echo-en-en-vslang-request-parameters.json",
         "response" : "language/expand-echo-en-en-vslang-response-valueSet.json"
       },{
         "name" : "language-echo-en-en-mixed",
         "operation" : "expand",
-        "Content-Language" : "es",
+        "Accept-Language" : "es",
         "request" : "language/expand-echo-en-en-mixed-request-parameters.json",
         "response" : "language/expand-echo-en-en-mixed-response-valueSet.json"
       },
@@ -336,7 +336,7 @@
       {
         "name" : "language-echo-de-de-header",
         "operation" : "expand",
-        "Content-Language" : "de",
+        "Accept-Language" : "de",
         "request" : "language/expand-echo-de-de-header-request-parameters.json",
         "response" : "language/expand-echo-de-de-header-response-valueSet.json"
       },
@@ -356,7 +356,7 @@
       {
         "name" : "language-echo-en-multi-en-header",
         "operation" : "expand",
-        "Content-Language" : "en",
+        "Accept-Language" : "en",
         "request" : "language/expand-echo-en-multi-en-header-request-parameters.json",
         "response" : "language/expand-echo-en-multi-en-header-response-valueSet.json"
       },
@@ -376,7 +376,7 @@
       {
         "name" : "language-echo-de-multi-de-header",
         "operation" : "expand",
-        "Content-Language" : "de",
+        "Accept-Language" : "de",
         "request" : "language/expand-echo-de-multi-de-header-request-parameters.json",
         "response" : "language/expand-echo-de-multi-de-header-response-valueSet.json"
       },
@@ -397,7 +397,7 @@
       {
         "name" : "language-xform-en-multi-de-default",
         "operation" : "expand",
-        "Content-Language" : "de,*",
+        "Accept-Language" : "de,*",
         "request" : "language/expand-xform-en-multi-de-default-request-parameters.json",
         "response" : "language/expand-xform-en-multi-de-default-response-valueSet.json"
       },
@@ -949,7 +949,7 @@
       {
         "name" : "validation-simple-coding-bad-language-header",
         "operation" : "validate-code",
-        "Content-Language" : "en, en-AU; q=0.4",
+        "Accept-Language" : "en, en-AU; q=0.4",
         "request" : "validation/simple-coding-bad-language-header-request-parameters.json",
         "response" :  "validation/simple-coding-bad-language-header-response-parameters.json"
       },