diff --git a/schemas/2018-06-01/Microsoft.DataFactory.json b/schemas/2018-06-01/Microsoft.DataFactory.json
index 5ac84a7188..3cc84cf8df 100644
--- a/schemas/2018-06-01/Microsoft.DataFactory.json
+++ b/schemas/2018-06-01/Microsoft.DataFactory.json
@@ -4398,8 +4398,18 @@
           "description": "Name of the Function that the Azure Function Activity will call. Type: string (or Expression with resultType string)"
         },
         "headers": {
-          "type": "object",
-          "properties": {},
+          "oneOf": [
+            {
+              "type": "object",
+              "additionalProperties": {
+                "type": "string"
+              },
+              "properties": {}
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
           "description": "Represents the headers that will be sent to the request. For example, to set the language and type on a request: \"headers\" : { \"Accept-Language\": \"en-us\", \"Content-Type\": \"application/json\" }. Type: string (or Expression with resultType string)."
         },
         "method": {
@@ -31773,8 +31783,18 @@
           "description": "When set to true, Certificate validation will be disabled."
         },
         "headers": {
-          "type": "object",
-          "properties": {},
+          "oneOf": [
+            {
+              "type": "object",
+              "additionalProperties": {
+                "type": "string"
+              },
+              "properties": {}
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
           "description": "Represents the headers that will be sent to the request. For example, to set the language and type on a request: \"headers\" : { \"Accept-Language\": \"en-us\", \"Content-Type\": \"application/json\" }. Type: string (or Expression with resultType string)."
         },
         "linkedServices": {
@@ -31965,8 +31985,18 @@
           "description": "Represents the payload that will be sent to the endpoint. Required for POST/PUT method, not allowed for GET method Type: string (or Expression with resultType string)."
         },
         "headers": {
-          "type": "object",
-          "properties": {},
+          "oneOf": [
+            {
+              "type": "object",
+              "additionalProperties": {
+                "type": "string"
+              },
+              "properties": {}
+            },
+            {
+              "$ref": "https://schema.management.azure.com/schemas/common/definitions.json#/definitions/expression"
+            }
+          ],
           "description": "Represents the headers that will be sent to the request. For example, to set the language and type on a request: \"headers\" : { \"Accept-Language\": \"en-us\", \"Content-Type\": \"application/json\" }. Type: string (or Expression with resultType string)."
         },
         "method": {