diff --git a/RELEASES.md b/RELEASES.md
index 907afb0..c8040ed 100644
--- a/RELEASES.md
+++ b/RELEASES.md
@@ -1,10 +1,13 @@
 ## Releases
 
-## 1.0.1 to 1.0.3
-Adds proxy support. 
+## 1.0.6
+Automatically sends Content-Type and Accept application/json headers for \<verb>Json() helper methods if not set in the client or parameters.
+
+## 1.0.5
+Adds \<verb>Json() helper methods for json over http scenarios.
 
 ## 1.0.4
 Started to add \<verb>Json() helper methods.  Do not use this release for that.  Use >= 1.0.5 since there was an issue with types.
 
-## 1.0.5
-Adds \<verb>Json() helper methods for json over http scenarios.
+## 1.0.1 to 1.0.3
+Adds proxy support.
\ No newline at end of file
diff --git a/__tests__/basics.test.ts b/__tests__/basics.test.ts
index a260fc4..eb1c3e9 100644
--- a/__tests__/basics.test.ts
+++ b/__tests__/basics.test.ts
@@ -9,6 +9,7 @@ interface HttpBinData {
     url: string;
     data: any;
     json: any;
+    headers: any;
     args?: any
 }
 
@@ -206,6 +207,8 @@ describe('basics', () => {
         expect(jsonObj.statusCode).toBe(200);
         expect(jsonObj.result).toBeDefined();
         expect(jsonObj.result.url).toBe('https://httpbin.org/get');
+        expect(jsonObj.result.headers["Accept"]).toBe(httpm.MediaTypes.ApplicationJson);
+        expect(jsonObj.headers[httpm.Headers.ContentType]).toBe(httpm.MediaTypes.ApplicationJson);
     });
     
     it('getting a non existent json object returns null', async() => {
@@ -221,6 +224,9 @@ describe('basics', () => {
         expect(restRes.result).toBeDefined(); 
         expect(restRes.result.url).toBe('https://httpbin.org/post');
         expect(restRes.result.json.name).toBe('foo');
+        expect(restRes.result.headers["Accept"]).toBe(httpm.MediaTypes.ApplicationJson);
+        expect(restRes.result.headers["Content-Type"]).toBe(httpm.MediaTypes.ApplicationJson);
+        expect(restRes.headers[httpm.Headers.ContentType]).toBe(httpm.MediaTypes.ApplicationJson);
     });
 
     it('puts a json object', async() => {
@@ -230,6 +236,10 @@ describe('basics', () => {
         expect(restRes.result).toBeDefined(); 
         expect(restRes.result.url).toBe('https://httpbin.org/put');
         expect(restRes.result.json.name).toBe('foo');
+
+        expect(restRes.result.headers["Accept"]).toBe(httpm.MediaTypes.ApplicationJson);
+        expect(restRes.result.headers["Content-Type"]).toBe(httpm.MediaTypes.ApplicationJson);
+        expect(restRes.headers[httpm.Headers.ContentType]).toBe(httpm.MediaTypes.ApplicationJson);
     });
     
     it('patch a json object', async() => {
@@ -239,5 +249,8 @@ describe('basics', () => {
         expect(restRes.result).toBeDefined(); 
         expect(restRes.result.url).toBe('https://httpbin.org/patch');
         expect(restRes.result.json.name).toBe('foo');
-    });    
-})
+        expect(restRes.result.headers["Accept"]).toBe(httpm.MediaTypes.ApplicationJson);
+        expect(restRes.result.headers["Content-Type"]).toBe(httpm.MediaTypes.ApplicationJson);
+        expect(restRes.headers[httpm.Headers.ContentType]).toBe(httpm.MediaTypes.ApplicationJson);
+    });
+});
diff --git a/__tests__/headers.test.ts b/__tests__/headers.test.ts
new file mode 100644
index 0000000..ca36191
--- /dev/null
+++ b/__tests__/headers.test.ts
@@ -0,0 +1,79 @@
+import * as httpm from '../_out';
+import * as ifm from '../_out/interfaces'
+
+describe('headers', () => {
+    let _http: httpm.HttpClient;
+
+    beforeEach(() => {
+        _http = new httpm.HttpClient('http-client-tests');
+    });
+
+    it('preserves existing headers on getJson', async() => {
+        let additionalHeaders = { [httpm.Headers.Accept]: "foo" };
+        let jsonObj: ifm.ITypedResponse<any> = await _http.getJson<any>('https://httpbin.org/get', additionalHeaders);
+        expect(jsonObj.result.headers["Accept"]).toBe("foo");
+        expect(jsonObj.headers[httpm.Headers.ContentType]).toBe(httpm.MediaTypes.ApplicationJson);
+
+        let httpWithHeaders = new httpm.HttpClient();
+        httpWithHeaders.requestOptions = {
+            headers: {
+                [httpm.Headers.Accept]: "baz"
+            }
+        };
+        jsonObj = await httpWithHeaders.getJson<any>('https://httpbin.org/get');
+        expect(jsonObj.result.headers["Accept"]).toBe("baz");
+        expect(jsonObj.headers[httpm.Headers.ContentType]).toBe(httpm.MediaTypes.ApplicationJson);
+    });
+
+    it('preserves existing headers on postJson', async() => {
+        let additionalHeaders = { [httpm.Headers.Accept]: "foo" };
+        let jsonObj: ifm.ITypedResponse<any> = await _http.postJson<any>('https://httpbin.org/post', {}, additionalHeaders);
+        expect(jsonObj.result.headers["Accept"]).toBe("foo");
+        expect(jsonObj.headers[httpm.Headers.ContentType]).toBe(httpm.MediaTypes.ApplicationJson);
+
+        let httpWithHeaders = new httpm.HttpClient();
+        httpWithHeaders.requestOptions = {
+            headers: {
+                [httpm.Headers.Accept]: "baz"
+            }
+        };
+        jsonObj = await httpWithHeaders.postJson<any>('https://httpbin.org/post', {});
+        expect(jsonObj.result.headers["Accept"]).toBe("baz");
+        expect(jsonObj.headers[httpm.Headers.ContentType]).toBe(httpm.MediaTypes.ApplicationJson);
+    });
+
+    it('preserves existing headers on putJson', async() => {
+        let additionalHeaders = { [httpm.Headers.Accept]: "foo" };
+        let jsonObj: ifm.ITypedResponse<any> = await _http.putJson<any>('https://httpbin.org/put', {}, additionalHeaders);
+        expect(jsonObj.result.headers["Accept"]).toBe("foo");
+        expect(jsonObj.headers[httpm.Headers.ContentType]).toBe(httpm.MediaTypes.ApplicationJson);
+
+        let httpWithHeaders = new httpm.HttpClient();
+        httpWithHeaders.requestOptions = {
+            headers: {
+                [httpm.Headers.Accept]: "baz"
+            }
+        };
+        jsonObj = await httpWithHeaders.putJson<any>('https://httpbin.org/put', {});
+        expect(jsonObj.result.headers["Accept"]).toBe("baz");
+        expect(jsonObj.headers[httpm.Headers.ContentType]).toBe(httpm.MediaTypes.ApplicationJson);
+    });
+
+    it('preserves existing headers on patchJson', async() => {
+        let additionalHeaders = { [httpm.Headers.Accept]: "foo" };
+        let jsonObj: ifm.ITypedResponse<any> = await _http.patchJson<any>('https://httpbin.org/patch', {}, additionalHeaders);
+        expect(jsonObj.result.headers["Accept"]).toBe("foo");
+        expect(jsonObj.headers[httpm.Headers.ContentType]).toBe(httpm.MediaTypes.ApplicationJson);
+
+        let httpWithHeaders = new httpm.HttpClient();
+        httpWithHeaders.requestOptions = {
+            headers: {
+                [httpm.Headers.Accept]: "baz"
+            }
+        };
+        jsonObj = await httpWithHeaders.patchJson<any>('https://httpbin.org/patch', {});
+        expect(jsonObj.result.headers["Accept"]).toBe("baz");
+        expect(jsonObj.headers[httpm.Headers.ContentType]).toBe(httpm.MediaTypes.ApplicationJson);
+    });
+
+});
diff --git a/index.ts b/index.ts
index 8507e02..c21fd44 100644
--- a/index.ts
+++ b/index.ts
@@ -35,6 +35,15 @@ export enum HttpCodes {
     GatewayTimeout = 504,
 }
 
+export enum Headers  {
+    Accept = "accept",
+    ContentType = "content-type"
+}
+
+export enum MediaTypes {
+    ApplicationJson = "application/json"
+}
+
 /**
  * Returns the proxy URL, depending upon the supplied url and proxy environment variables.
  * @param serverUrl  The server URL where the request will be sent. For example, https://api.github.com
@@ -166,25 +175,32 @@ export class HttpClient {
      * Gets a typed object from an endpoint
      * Be aware that not found returns a null.  Other errors (4xx, 5xx) reject the promise
      */
-    public async getJson<T>(requestUrl: string, additionalHeaders?: ifm.IHeaders): Promise<ifm.ITypedResponse<T>> {
+    public async getJson<T>(requestUrl: string, additionalHeaders: ifm.IHeaders = {}): Promise<ifm.ITypedResponse<T>> {
+        additionalHeaders[Headers.Accept] = this._getExistingOrDefaultHeader(additionalHeaders, Headers.Accept, MediaTypes.ApplicationJson)
         let res: ifm.IHttpClientResponse = await this.get(requestUrl, additionalHeaders);
         return this._processResponse<T>(res, this.requestOptions);
     }
     
-    public async postJson<T>(requestUrl: string, obj: any, additionalHeaders?: ifm.IHeaders): Promise<ifm.ITypedResponse<T>> {
+    public async postJson<T>(requestUrl: string, obj: any, additionalHeaders: ifm.IHeaders = {}): Promise<ifm.ITypedResponse<T>> {
         let data: string = JSON.stringify(obj, null, 2);
+        additionalHeaders[Headers.Accept] = this._getExistingOrDefaultHeader(additionalHeaders, Headers.Accept, MediaTypes.ApplicationJson)
+        additionalHeaders[Headers.ContentType] = this._getExistingOrDefaultHeader(additionalHeaders, Headers.ContentType, MediaTypes.ApplicationJson);
         let res: ifm.IHttpClientResponse = await this.post(requestUrl, data, additionalHeaders);
         return this._processResponse<T>(res, this.requestOptions);
     }
 
-    public async putJson<T>(requestUrl: string, obj: any, additionalHeaders?: ifm.IHeaders): Promise<ifm.ITypedResponse<T>> {
+    public async putJson<T>(requestUrl: string, obj: any, additionalHeaders: ifm.IHeaders = {}): Promise<ifm.ITypedResponse<T>> {
         let data: string = JSON.stringify(obj, null, 2);
+        additionalHeaders[Headers.Accept] = this._getExistingOrDefaultHeader(additionalHeaders, Headers.Accept, MediaTypes.ApplicationJson)
+        additionalHeaders[Headers.ContentType] = this._getExistingOrDefaultHeader(additionalHeaders, Headers.ContentType, MediaTypes.ApplicationJson);
         let res: ifm.IHttpClientResponse = await this.put(requestUrl, data, additionalHeaders);
         return this._processResponse<T>(res, this.requestOptions);
     }    
 
-    public async patchJson<T>(requestUrl: string, obj: any, additionalHeaders?: ifm.IHeaders): Promise<ifm.ITypedResponse<T>> {
+    public async patchJson<T>(requestUrl: string, obj: any, additionalHeaders: ifm.IHeaders = {}): Promise<ifm.ITypedResponse<T>> {
         let data: string = JSON.stringify(obj, null, 2);
+        additionalHeaders[Headers.Accept] = this._getExistingOrDefaultHeader(additionalHeaders, Headers.Accept, MediaTypes.ApplicationJson)
+        additionalHeaders[Headers.ContentType] = this._getExistingOrDefaultHeader(additionalHeaders, Headers.ContentType, MediaTypes.ApplicationJson);
         let res: ifm.IHttpClientResponse = await this.patch(requestUrl, data, additionalHeaders);
         return this._processResponse<T>(res, this.requestOptions);
     }    
@@ -416,6 +432,14 @@ export class HttpClient {
         return lowercaseKeys(headers || {});
     }
 
+    private _getExistingOrDefaultHeader(additionalHeaders: ifm.IHeaders, header: string, _default: string) {
+        let clientHeader: string;
+        if(this.requestOptions && this.requestOptions.headers) {
+            clientHeader =  this.requestOptions.headers[header];
+        }
+        return additionalHeaders[header] || clientHeader || _default;
+    }
+
     private _getAgent(parsedUrl: url.Url): http.Agent {
         let agent;
         let proxyUrl: url.Url = pm.getProxyUrl(parsedUrl);
diff --git a/package-lock.json b/package-lock.json
index 710e48a..1631c03 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@actions/http-client",
-  "version": "1.0.5",
+  "version": "1.0.6",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index b566366..a34486d 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@actions/http-client",
-  "version": "1.0.5",
+  "version": "1.0.6",
   "description": "Actions Http Client",
   "main": "index.js",
   "scripts": {