Updated Request Matching (markdown)

Request-Matching.md

@@ -4,11 +4,17 @@ WireMock.Net supports matching of requests to stubs and verification queries usi
 * Path
 * URL
 * HTTP Method
-* Query parameters
-* Headers
+* [Query parameters](#query-parameters)
+* [Headers](#headers)
 * Cookies
 * Request Body
 
+## Generic information on matchers:
+
+Most matchers have 2 extra properties:
+- IgnoreCase = define that the matcher should match ignoring the case
+- RejectOnMatch = define that when the matcher does match successfully, this should be counted as a invalid (non-matching) match
+
 ## Example Matching for the elements
 
 ### Query Parameters
@@ -39,6 +45,47 @@ server
 }
 ```
 
+### Headers
+#### C#
+``` c#
+// todo
+```
+
+#### JSON
+``` json
+{
+  "Request": {
+    "Headers": [
+      {
+        "Name": "api-key",
+        "Matchers": [
+          {
+            "Name": "WildcardMatcher",
+            "Pattern": "abc*"
+            "IgnoreCase": true
+          }
+        ]
+      }
+    ]
+  }
+}
+```
+
+Note that when you want to match on a missing header, you need to use this mapping:
+``` json
+{
+  "Request": {
+    "Headers": [
+    {
+      "Name": "api-key",
+      "IgnoreCase": true,
+      "RejectOnMatch": true
+    }
+  }
+]
+```
+This means that when the header-key `api-key` (ignoring the casing) is missing the header mapping will match because `RejectOnMatch` is `true`.
+
 # :two: Matchers
 The following paragraphs describe in detail which matchers can be used.