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Доброго времени суток. Пытаюсь написать для Ардуино POST запрос на сервер. Весь скеч на основе примера WebClient

/*
  Web client

 This sketch connects to a website (http://www.google.com)
 using an Arduino Wiznet Ethernet shield.

 Circuit:
 * Ethernet shield attached to pins 10, 11, 12, 13

 created 18 Dec 2009
 by David A. Mellis
 modified 9 Apr 2012
 by Tom Igoe, based on work by Adrian McEwen

 */

#include <SPI.h>
#include <Ethernet.h>

// Enter a MAC address for your controller below.
// Newer Ethernet shields have a MAC address printed on a sticker on the shield
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
//IPAddress server(178,170,244,14);  // numeric IP for Google (no DNS)
char server[] = "http://fcm.googleapis.com";    // name address for Google (using DNS)
char ServerKey[] = "AAAAPNK56lw:APA91bHyjROWuWsqm6tC_gel_j571G1TQFGzW0fHVFgkZeao3XW0I65_7FqttzYYrycpBLmmIzLgymp4N9DlM9_T5r411XkbCippepCdTyBs9fPFcCNA03va5kcqU4SnlvLvkmttzzM_";
String Data ="{\"registration_ids\":[\"APA91bHGh9fdAmxxGeFGs5dQShJAtb1zBip75QoNeFEyDCSWQ9eNsraoq51HVS9nwIdgGEDhs2nDV19oAEezZZpkHavuQc8sx8bTlzE6osVwHxWO5cuslp79LnicfcBmwnsYINtymvab\"],\"priority\":\"high\",\"notification\":{\"body\":\"test\",\"title\":\"UmDom\",\"sound\":\"default\",\"icon\":\"1\"},\"data\":{\"message\":\"test\",\"title\":\"UmDom\"}}";

// Set the static IP address to use if the DHCP fails to assign
IPAddress ip(192, 168, 1, 10);
IPAddress myDns(192, 168, 1, 1);
IPAddress myGate(192, 168, 1, 1);

// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
EthernetClient client;

unsigned long beginMicros, endMicros;
unsigned long byteCount=0;

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  // start the Ethernet connection:
  Serial.println("Initialize Ethernet with DHCP:");
  if (Ethernet.begin(mac) == 0) {
    Serial.println("Failed to configure Ethernet using DHCP");
    // no point in carrying on, so do nothing forevermore:
    // try to congifure using IP address instead of DHCP:
    Ethernet.begin(mac, ip, myDns);
  } else {
    Serial.print("  DHCP assigned IP ");
    Serial.println(Ethernet.localIP());
  }
  // give the Ethernet shield a second to initialize:
  delay(1000);
  Serial.print("connecting to ");
  Serial.print(server);
  Serial.println("...");

  // if you get a connection, report back via serial:
  if (client.connect(server, 80)) {
    Serial.println("connected");
    // Make a HTTP request:
    client.println("POST /fcm/send HTTP/1.1");
    client.println("Content-Type: application/json");
    client.print("Authorization: key=");
    client.println(ServerKey);
    //client.println("Authorization: key=AAAAPNK56lw:APA91bHyjROWuWsqm6tC_gel_j571G1TQFGzW0fHVFgkZeao3XW0I65_7FqttzYYrycpBLmmIzLgymp4N9DlM9_T5r411XkbCippepCdTyBs9fPFcCNA03va5kcqU4SnlvLvkmttzzM_");
    client.println("Host: http://fcm.googleapis.com");
    client.print("Content-Length: ");
    client.println(Data.length());  
    client.println();
    client.println(Data);      
    client.println("Connection: close");
  } else {
    // if you didn't get a connection to the server:
    Serial.println("connection failed");
  }
  beginMicros = micros();
}

void loop() {
  // if there are incoming bytes available
  // from the server, read them and print them:
  int len = client.available();
  if (len > 0) {
    byte buffer[80];
    if (len > 80) len = 80;
    client.read(buffer, len);
    Serial.write(buffer, len); // show in the serial monitor (slows some boards)
    byteCount = byteCount + len;
  }

  // if the server's disconnected, stop the client:
  if (!client.connected()) {
    endMicros = micros();
    Serial.println();
    Serial.println("disconnecting.");
    client.stop();
    Serial.print("Received ");
    Serial.print(byteCount);
    Serial.print(" bytes in ");
    float seconds = (float)(endMicros - beginMicros) / 1000000.0;
    Serial.print(seconds, 4);
    float rate = (float)byteCount / seconds / 1000.0;
    Serial.print(", rate = ");
    Serial.print(rate);
    Serial.print(" kbytes/second");
    Serial.println();

    // do nothing forevermore:
    while (true);
  }
}

Получаю ответ 400 Bad Request/

Точно знаю, что сервис рабочий, все отрабатывает в программе написанной на Delphi и в REST Client (плагин к Chrome https://chrome.google.com/webstore/detail/advanced-rest-client/hgmloofddffdnphfgcellkdfbfbjeloo)

Собственно несколько вопросов к гуру (я не силен в написании запросов)

1. В заголовке должен быть Authorization: key=хххх;

Правильная ли запись client.println("Authorization: key=xxxxx"); Или заголовки надо как-то отдельно выделять.

2. ТО же самое касается client.println("Content-Type: application/json"); Как правильно послать строку json?

Заранее спасибо за ответы!!!!