diff --git a/config/user-agent.yaml b/config/user-agent.yaml
new file mode 100644
index 0000000..ca974dd
--- /dev/null
+++ b/config/user-agent.yaml
@@ -0,0 +1,14 @@
+request: 
+  method: GET
+  path: /user-agent
+response:
+  statusCode: 200
+  headers:
+    Content-Type: 
+      - "application/json"
+  body: >
+    [
+      {  
+        "user_agent":"{{request.header.User-Agent}}"
+      }
+    ]
\ No newline at end of file
diff --git a/vars/request.go b/vars/request.go
index d2e3214..596120e 100644
--- a/vars/request.go
+++ b/vars/request.go
@@ -48,6 +48,8 @@ func (rp Request) Fill(holders []string) map[string]string {
 			s, found = rp.getPathParam(tag[13:])
 		} else if strings.HasPrefix(tag, "request.cookie.") {
 			s, found = rp.getCookieParam(tag[15:])
+		} else if strings.HasPrefix(tag, "request.header.") {
+			s, found = rp.getHeaderParam(tag[15:])
 		}
 
 		if found {
@@ -145,6 +147,19 @@ func (rp Request) getCookieParam(name string) (string, bool) {
 	return value, true
 }
 
+func (rp Request) getHeaderParam(name string) (string, bool) {
+
+	value, f := rp.Request.HttpHeaders.Headers[name]
+	if !f || len(rp.Request.HttpHeaders.Headers) == 0 {
+		return "", false
+	}
+	if len(value) == 0 {
+		return "", false
+	}
+
+	return value[0], true
+}
+
 func (rp Request) getBodyParam(name string) (string, bool) {
 
 	contentType, found := rp.Request.Headers["Content-Type"]
diff --git a/vars/request_test.go b/vars/request_test.go
new file mode 100644
index 0000000..b0c7989
--- /dev/null
+++ b/vars/request_test.go
@@ -0,0 +1,55 @@
+package vars
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/jmartin82/mmock/definition"
+)
+
+func TestGetHeaderParam(t *testing.T) {
+	rp := Request{}
+	header := make(definition.Values)
+	header["Authorization"] = []string{"Bearer abc123"}
+	req := definition.Request{}
+	req.Headers = header
+	rp.Request = &req
+	v, f := rp.getHeaderParam("Authorization")
+	if !f {
+		t.Errorf("Header key not found")
+	}
+
+	if !strings.EqualFold(v, "Bearer abc123") {
+		t.Errorf("Couldn't get the content. Value: %s", v)
+	}
+}
+
+func TestGetHeaderParamNotFoundHeaderKey(t *testing.T) {
+	rp := Request{}
+	header := make(definition.Values)
+	header["Authorization"] = []string{"Bearer abc123"}
+	req := definition.Request{}
+	req.Headers = header
+	rp.Request = &req
+	_, f := rp.getHeaderParam("Authorization2")
+	if f {
+		t.Errorf("Header key found")
+	}
+}
+
+func TestGetHeaderParamWithOutHeaderValue(t *testing.T) {
+	rp := Request{}
+	header := make(definition.Values)
+	header["Authorization"] = []string{}
+	req := definition.Request{}
+	req.Headers = header
+	rp.Request = &req
+	v, f := rp.getHeaderParam("Authorization")
+	if f {
+		t.Errorf("Header key found")
+	}
+
+	if strings.EqualFold(v, "Bearer abc1235") {
+		t.Errorf("Couldn get the content. Value: %s", v)
+	}
+}