Can't serialize JSon

Hi,

I can’t deserialize a JSon request.

the .h :

// Fill out your copyright notice in the Description page of Project Settings.

#pragma once

#include "GameFramework/GameMode.h"
#include "Runtime/Online/HTTP/Public/Http.h"
#include "FICEGameMode.generated.h"

/**
 * 
 */
UCLASS()
class FICE_API AFICEGameMode : public AGameMode
{
	GENERATED_BODY()

	TSharedPtr<FJsonObject> JsonObject;

		FHttpModule* Http;

	/* The actuall HTTP call */
	UFUNCTION()
		void MyHttpCall();

	/*Assign this function to call when the GET request processes sucessfully*/

	void OnResponseReceived(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bWasSuccessful);

	// Sets default values for this actor's properties
	AFICEGameMode(const class FObjectInitializer& ObjectInitializer);

	// Called when the game starts or when spawned
	virtual void BeginPlay() override;
	
};

The .CPP

// Fill out your copyright notice in the Description page of Project Settings.

#include "FICE.h"
#include "FICEGameMode.h"



// Sets default values
AFICEGameMode::AFICEGameMode(const class FObjectInitializer& ObjectInitializer)
	: Super(ObjectInitializer)
{
	//When the object is constructed, Get the HTTP module
	Http = &FHttpModule::Get();
}

// Called when the game starts or when spawned
void AFICEGameMode::BeginPlay()
{
	MyHttpCall();
	Super::BeginPlay();
}

/*Http call*/
void AFICEGameMode::MyHttpCall()
{
	TSharedRef<IHttpRequest> Request = Http->CreateRequest();
	Request->OnProcessRequestComplete().BindUObject(this, &AFICEGameMode::OnResponseReceived);
	//This is the url on which to process the request
	Request->SetURL("http://www.localfice.fr/fice3d/httprequest.php");
	Request->SetVerb("GET");
	Request->SetHeader(TEXT("User-Agent"), "X-UnrealEngine-Agent");
	Request->SetHeader("Content-Type", TEXT("application/json"));
	Request->ProcessRequest();
}

/*Assigned function on successfull http call*/
void AFICEGameMode::OnResponseReceived(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bWasSuccessful)
{
	//Create a pointer to hold the json serialized data
	int responseCode = Response->GetResponseCode();
	FString s = "OnResponseReceived : " + FString::FromInt(responseCode);
	GEngine->AddOnScreenDebugMessage(-1, 12.0f, FColor::Green, Response->GetContentAsString());

	//Create a reader pointer to read the json data
	TSharedRef<TJsonReader<>> Reader = TJsonReaderFactory<>::Create(Response->GetContentAsString());

	//Deserialize the json data given Reader and the actual object to deserialize
	if (FJsonSerializer::Deserialize(Reader, JsonObject))
	{
		GEngine->AddOnScreenDebugMessage(-1, 2.0f, FColor::Green, "Deserialized");
		//Get the value of the json object by field name
		//int32 recievedInt = JsonObject->GetIntegerField("customInt");
		int i = 0;
		for (TPair<FString, TSharedPtr<FJsonValue>> & Elem : JsonObject->Values)
		{
			GEngine->AddOnScreenDebugMessage(i, 2.0f, FColor::Blue, Elem.Value->AsString());
			i++;
		}
		//Output it to the engine
	}
	else
	{
		GEngine->AddOnScreenDebugMessage(-1, 2.0f, FColor::Red, "NOT Deserialize");
	}
}

The .PHP
<?php
//Create a variable to be used in
$theVar = array();
$host = “127.0.0.1”;
$user = “root”;
$psw = “”;
$db = “fice”;

	$connection = mysql_connect($host, $user, $psw) or die("Erreur de connection à la base de données");
	mysql_select_db($db, $connection);

	$query = "SELECT * FROM categories WHERE categorie=0 ORDER BY nom";
	$result =  mysql_query($query) or die(mysql_error());
	
	while($obj = mysql_fetch_object($result))
	{
		$theVar[$obj->id] = $obj;
	}
 
	//Set the headers
	header('Content-Type: application/json');
 
	//Encode the variable, and save the encoded string
	$encoded = json_encode($theVar);
 
	//Output it
	echo $encoded;
?>

The returned string (as shown by direct access to the PHP in chrome, without unreal)

{“3”:{“id”:“3”,“nom”:“Festival Astro-Jeune”,“soustitre”:"",“description”:null,“texte”:“7”,“image”:"",“baniere”:“astrojeune-2014.jpg”,“categorie”:“0”,“style”:""},“2”:{“id”:“2”,“nom”:“Festival d’Astronomie de Fleurance”,“soustitre”:"",“description”:"",“texte”:“0”,“image”:"",“baniere”:“festival-2014.jpg”,“categorie”:“0”,“style”:""},“4”:{“id”:“4”,“nom”:null,“soustitre”:"",“description”:"",“texte”:“0”,“image”:"",“baniere”:“evenements-2014.jpg”,“categorie”:“0”,“style”:""},“1”:{“id”:“1”,“nom”:“Marathon des Sciences”,“soustitre”:null,“description”:null,“texte”:“1”,“image”:"",“baniere”:“marathon-2016.jpg”,“categorie”:“0”,“style”:""}}

PhP file must be in UTF-8 and without BOM