diff --git a/internal/resources/webform/webform-sample.css b/internal/resources/webform/webform-sample.css
index 5fc7302..2d390a5 100644
--- a/internal/resources/webform/webform-sample.css
+++ b/internal/resources/webform/webform-sample.css
@@ -202,6 +202,10 @@ textarea#grpc-request-raw-text {
     height: 200px;
 }
 
+textarea#grpc-request-raw-header {
+    height: 200px;
+}
+
 #grpc-request-timeout {
     margin-bottom: 20px;
 }
@@ -273,7 +277,7 @@ table#grpc-request-metadata-form {
     padding-left: 0;
 }
 
-#grpc-request-form tr:first-of-type > td {
+#grpc-request-form tr:first-of-type>td {
     padding-top: 0;
 }
 
@@ -288,7 +292,7 @@ table#grpc-request-metadata-form {
     padding-left: 0;
 }
 
-#grpc-request-form tr:first-of-type > th {
+#grpc-request-form tr:first-of-type>th {
     padding-top: 0;
 }
 
@@ -471,7 +475,7 @@ table#grpc-request-metadata-form {
     display: inline-block;
 }
 
-#grpc-request-form div.grpc-timestamp > input {
+#grpc-request-form div.grpc-timestamp>input {
     margin: 4px;
 }
 
@@ -524,7 +528,8 @@ table#grpc-request-metadata-form {
     margin: 2px;
 }
 
-.grpc-metadata-table td, .grpc-metadata-table th {
+.grpc-metadata-table td,
+.grpc-metadata-table th {
     padding: 8px;
     border: 1px solid #eee;
     font-family: "courier new", courier, monospace;
@@ -577,7 +582,7 @@ textarea.grpc-response-textarea {
     font-weight: bold;
 }
 
-#grpc-response-data tr:first-of-type > td {
+#grpc-response-data tr:first-of-type>td {
     padding-top: 0;
 }
 
@@ -632,7 +637,8 @@ textarea.grpc-response-textarea {
     color: #c00;
 }
 
-button#grpc-history-clear, button#grpc-history-save {
+button#grpc-history-clear,
+button#grpc-history-save {
     margin-bottom: 16px;
     font-size: 96%;
     padding: 8px 15px;
@@ -669,7 +675,7 @@ button#grpc-history-clear, button#grpc-history-save {
     color: #000;
 }
 
-#grpc-history-list > .ui-accordion:first-child {
+#grpc-history-list>.ui-accordion:first-child {
     border-top: 1px solid #eee;
 }
 
@@ -762,4 +768,4 @@ button#grpc-history-clear, button#grpc-history-save {
     border: 1px solid #dddddd;
     padding: 1em;
     margin-bottom: 1em;
-}
+}
\ No newline at end of file
diff --git a/internal/resources/webform/webform-template.html b/internal/resources/webform/webform-template.html
index 79e5df4..95af631 100644
--- a/internal/resources/webform/webform-template.html
+++ b/internal/resources/webform/webform-template.html
@@ -70,6 +70,11 @@ <h3>Request Timeout</h3>
         <button class="grpc-invoke" disabled>Invoke</button>
       </div>
       <div class="grpc-tabcontent" id="grpc-request-raw-tab">
+        <div class="grpc-request-raw-container">
+          <h3>Request Header</h3>
+          <textarea id="grpc-request-raw-header"></textarea><br/>
+          <button class="button-header">Add Headaer</button>
+        </div>
         <div class="grpc-request-raw-container">
           <h3>Request payload</h3>
           <textarea id="grpc-request-raw-text"></textarea><br/>
diff --git a/internal/resources/webform/webform.js b/internal/resources/webform/webform.js
index b0c3907..ba0bff0 100644
--- a/internal/resources/webform/webform.js
+++ b/internal/resources/webform/webform.js
@@ -2855,6 +2855,15 @@ window.initGRPCForm = function(services, svcDescs, mtdDescs, invokeURI, metadata
             invoke();
         }
     });
+    $(".button-header").click(function(e) {
+        if (onlyIfValid(e)) {
+            $('.metadataRow').closest("tr").remove();
+            $.each($('#grpc-request-raw-header').val().split(/\n/), function(i, line) {
+                let pair = line.split(':');
+                addMetadataRow(pair[0], pair[1]);
+            });
+        }
+    });
 
     if (localStorage.getItem(expandDescStorageKey) === "true") {
         descriptionsShown = true;