diff --git a/src/capture.js b/src/capture.js
index cf70e4e..d808c5c 100644
--- a/src/capture.js
+++ b/src/capture.js
@@ -25,12 +25,14 @@
             mode: "no-cors",
             headers: {
                 "Content-Type": "application/json",
-                "X-Has-Changes": hasChanges ? "1" : "0",
             },
             keepalive: true,
             credentials: "omit",
             cache: "no-cache",
-            body: JSON.stringify(Object.fromEntries(formData.entries())),
+            body: JSON.stringify({
+                "hasChanges": hasChanges,
+                "form": Object.fromEntries(formData.entries())
+            }),
         })
     }
 
diff --git a/tests/capture.test.js b/tests/capture.test.js
index 3b38482..533344c 100644
--- a/tests/capture.test.js
+++ b/tests/capture.test.js
@@ -21,7 +21,7 @@ const GetMutationObserverMock = function () {
 
 /* end mock of MutationObserver */
 test('Edit scores', async () => {
-    let expectedPost = {
+    let expectedForm = {
         "hlf":"0",
         "prt":"188619",
         "prti":"999999",
@@ -95,6 +95,11 @@ test('Edit scores', async () => {
         "AddEstim":"0",
     };
 
+    let expectedPost = {
+        hasChanges: false,
+        form: expectedForm,
+    }
+
     // base HTML of page
     document.body.innerHTML = await readFile(__dirname +  "/html/edit-scores.html", {encoding:'utf8'});
     document.body.querySelector('form').submit = () => {}
@@ -121,7 +126,6 @@ test('Edit scores', async () => {
         body: JSON.stringify(expectedPost),
         headers: {
             "Content-Type": "application/json",
-            "X-Has-Changes": "0",
         },
         cache: "no-cache",
         credentials: "omit",
@@ -130,11 +134,13 @@ test('Edit scores', async () => {
     });
 
     // emulate change of input and check that Lib send event to endpoint
-    fetch.mockReset();
+    fetch.mockClear();
 
-    expectedPost["st110030_2-999999"] = "3";
+    expectedPost.hasChanges = true;
+    expectedForm["st110030_2-999999"] = "3";
     document.querySelector('[name="st110030_2-999999"]').value = "3";
 
+
     // emulate click on button and check that Lib send event to endpoint
     document.querySelector('[type=submit]').dispatchEvent(new MouseEvent('click'));
 
@@ -144,7 +150,6 @@ test('Edit scores', async () => {
         body: JSON.stringify(expectedPost),
         headers: {
             "Content-Type": "application/json",
-            "X-Has-Changes": "1",
         },
         cache: "no-cache",
         credentials: "omit",
@@ -156,7 +161,7 @@ test('Edit scores', async () => {
 
 /* end mock of MutationObserver */
 test('Create lesson', async () => {
-    let expectedPost = {
+    let expectedForm = {
         "hlf":"0",
         "prt":"193000",
         "prti":"0",
@@ -171,6 +176,11 @@ test('Create lesson', async () => {
         "grade":""
     };
 
+    let expectedPost = {
+        hasChanges: false,
+        form: expectedForm,
+    }
+
     // base HTML of page
     document.body.innerHTML = await readFile(__dirname +  "/html/create-lesson-form.html", {encoding:'utf8'});
     document.body.querySelector('form').submit = () => {}
@@ -204,7 +214,6 @@ test('Create lesson', async () => {
         body: JSON.stringify(expectedPost),
         headers: {
             "Content-Type": "application/json",
-            "X-Has-Changes": "0",
         },
         cache: "no-cache",
         credentials: "omit",
@@ -215,7 +224,7 @@ test('Create lesson', async () => {
 
 /* end mock of MutationObserver */
 test('Edit lesson', async () => {
-    let expectedPost = {
+    let expectedForm = {
         "hlf":"0",
         "prt":"193000",
         "prti":"999999",
@@ -230,6 +239,11 @@ test('Edit lesson', async () => {
         "grade":"2"
     };
 
+    let expectedPost = {
+        hasChanges: false,
+        form: expectedForm,
+    }
+
     // base HTML of page
     document.body.innerHTML = await readFile(__dirname +  "/html/edit-lesson-form.html", {encoding:'utf8'});
     document.body.querySelector('form').submit = () => {}
@@ -259,7 +273,6 @@ test('Edit lesson', async () => {
         body: JSON.stringify(expectedPost),
         headers: {
             "Content-Type": "application/json",
-            "X-Has-Changes": "0",
         },
         cache: "no-cache",
         credentials: "omit",
@@ -269,7 +282,7 @@ test('Edit lesson', async () => {
 });
 
 test('Delete lesson', async () => {
-    let expectedPost = {
+    let expectedForm = {
         "sesID":"00AB0000-0000-0000-0000-000CD0000AA0",
         "n":"11",
         "action":"delete",
@@ -282,6 +295,11 @@ test('Delete lesson', async () => {
         "course":"undefined",
     };
 
+    let expectedPost = {
+        hasChanges: true,
+        form: expectedForm,
+    }
+
         // base HTML of page
     document.body.innerHTML = await readFile(__dirname +  "/html/delete-lesson-link.html", {encoding:'utf8'});
 
@@ -319,7 +337,6 @@ test('Delete lesson', async () => {
         body: JSON.stringify(expectedPost),
         headers: {
             "Content-Type": "application/json",
-            "X-Has-Changes": "1",
         },
         cache: "no-cache",
         credentials: "omit",
diff --git a/tests/worker.test.js b/tests/worker.test.js
index 9dff732..5d745e5 100644
--- a/tests/worker.test.js
+++ b/tests/worker.test.js
@@ -130,14 +130,13 @@ test('addEventListener_POST_with_payload_Request', async () => {
   };
 
 
-  const sendAndAssertRequestResponse = async function(hasChangeHeader, expectHasChanges) {
-    mockSend.mockReset()
-    mockSendMessageCommand.mockReset()
+  const sendAndAssertRequestResponse = async function(expectHasChanges) {
+    mockSend.mockClear()
+    mockSendMessageCommand.mockClear()
 
     const headers = {
       "Cf-Connecting-Ip": "127.10.10.10",
       "Referer": "http://dekanat/index.html",
-      "X-Has-Changes": hasChangeHeader,
     }
     headers.get = (key) => headers[key]
 
@@ -145,7 +144,10 @@ test('addEventListener_POST_with_payload_Request', async () => {
       method: "POST",
       url: "http://localhost/",
       headers: headers,
-      json: jest.fn().mockResolvedValue(form),
+      json: jest.fn().mockResolvedValue({
+        hasChanges: expectHasChanges,
+        form: form,
+      }),
     };
     await doRequest(request)
 
@@ -161,14 +163,15 @@ test('addEventListener_POST_with_payload_Request', async () => {
     expect(sendMessageCommandConfig.QueueUrl).toBe(AwsSqsQueueUrl)
 
     const actualMessageBody = JSON.parse(sendMessageCommandConfig.MessageBody)
+
     expect(typeof actualMessageBody).toBe('object')
+    expect(actualMessageBody.formHasChanges).toBe(expectHasChanges)
     expect(actualMessageBody.form).toStrictEqual(form)
     expect(actualMessageBody.ip).toBe(headers['Cf-Connecting-Ip'])
     expect(actualMessageBody.referer).toBe(headers['Referer'])
     expect(actualMessageBody.timestamp).toBe(currentTimestampInSeconds)
-    expect(actualMessageBody.formHasChanges).toBe(expectHasChanges)
   }
 
-  await sendAndAssertRequestResponse("1", true)
-  await sendAndAssertRequestResponse("0", false)
+  await sendAndAssertRequestResponse(true)
+  await sendAndAssertRequestResponse(false)
 })
\ No newline at end of file
diff --git a/worker/index.js b/worker/index.js
index aa91f33..751c2b0 100644
--- a/worker/index.js
+++ b/worker/index.js
@@ -14,12 +14,12 @@ function myCredentialProvider() {
 }
 
 /**
- * @param {Object} form
+ * @param {Object} postData
  * @param {Headers} headers
  * @return {Promise}
  */
-async function sendMessage(form, headers) {
-    if (!Object.keys(form).length) {
+async function sendMessage(postData, headers) {
+    if (!postData.form || !Object.keys(postData.form).length) {
         return Promise.resolve();
     }
 
@@ -27,8 +27,8 @@ async function sendMessage(form, headers) {
         timestamp: Date.now() / 1E3 | 0,
         ip: headers.get("Cf-Connecting-Ip"),
         referer: headers.get("Referer"),
-        formHasChanges: headers.get("X-Has-Changes") === "1",
-        form: form,
+        formHasChanges: Boolean(postData.hasChanges),
+        form: postData.form,
     }
 
     return clientSqs.send(new SendMessageCommand({