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Using RESTful API to work with AWS IoT

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I've been tinkering with AWS IoT in conjunction with CC3200 + Energia for a while now with varying degrees of success. The purpose of this post is using the RESTful API to update a "thing" status in the cloud. The code is listed below and I'm seeing some authentication errors. I was hoping someone can correct me if there are any errors in the way I'm using "client.ssConnect". I used a slightly modified WiFiClient.cpp and WiFiClient.h from here. I know its not a library issue since I'm able to connect using MQTT. 

char aws_endpoint[] = "xxxxxxxxxxxxxx.iot.us-east-1.amazonaws.com";
if (client.sslConnect(aws_endpoint, 443))
    Serial.println("Connected to server");
    String PostData = "{\"value1\" : \"testValue\", \"value2\" : \"Hello\", \"value3\" : \"World!\" }";
    request = "POST /things/";
    request += thingname;
    request += "/shadow";
    request += " HTTP/1.1";
    Serial.print("Request:\t"); Serial.println(request);
    Serial.print("Post data:\t"); Serial.println(PostData);
    client.println("Host: ");
    client.println("User-Agent: Energia/1.1");
    client.println("Connection: close");
    client.println("Content-Type: application/json");
    client.print("Content-Length: "); client.println(PostData.length());
    Serial.println("Connection failed");
  // Capture response from the server. (10 second timeout)
  long timeOut = 5000;
  long lastTime = millis();
  while((millis()-lastTime) < timeOut)
  { // Wait for incoming response from server
    while (client.available()) 
    { // Characters incoming from the server
      char c = client.read();            // Read characters

Here is the output that I see:

RootCA found!
Client certificates found!

Device ID is:	3250763216

Attempting to connect to WiFi network .
Connected to WiFi network: ABCDEFGH
Waiting for IP 
IP is:
Connected to server
Request:	POST /things/MyCC3200/shadow HTTP/1.1
Post data:	{\"value1\" : \"testValue\", \"value2\" : \"Hello\", \"value3\" : \"World!\" }

HTTP/1.1 403 Forbidden
content-type: application/json
content-length: 91
date: Tue, 26 Jul 2016 11:46:59 GMT
x-amzn-RequestId: 4d5388a9-e3c4-460a-b674-c3f971f3330d
connection: Keep-Alive
x-amzn-ErrorType: ForbiddenException:

{"message":"Missing Authentication Token","traceId":"4d5388a9-e3c4-460a-b674-c3f971f3330d"}

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