How to receive HTTP response from a php script?

Development Programming & Scripting
1

Hi. I have setup my project so that it sends post data to a website (php script). This is working fine. But, I want to receive a string back from the website. In my php, I am doing echo of the string I want to send back. In my project, this is my setup:

bool AHTTPHandlerActor::TransmitRequest()

{

FSagRequest CurrentRequest;

FString Dest;
Dest.Equals("XYZ.php");
CurrentRequest.SetDestination(Dest);

TSharedRef<IHttpRequest> Request = FHttpModule::Get().CreateRequest();

Request->SetHeader("Content-Type", "application/x-www-form-urlencoded");
Request->SetURL(TEXT("http://ABC.com/XYZ.php"));
Request->SetVerb(TEXT("POST"));



FString NumberOfLevelsString(TEXT("NumberOfLevels"));
FString NumberOfLevelsStringValue = FString::FromInt(GlobalArrayLength);

CurrentRequest.AddURLPair(NumberOfLevelsString, NumberOfLevelsStringValue); //This internally makes the              //                                              //string to send. This works, because I am successfully sending data to the website.  




Request->SetContentAsString(CurrentRequest.TheData);

Request->OnProcessRequestComplete().BindUObject(this, &AHTTPHandlerActor::OnResponseReceived);




if (!Request->ProcessRequest())
{
	
	return false;
}

delete LevelData;
return true;

}

Here is the responseReceived function:

 void AHTTPHandlerActor::OnResponseReceived(FHttpRequestPtr Request, FHttpResponsePtr Response,          bool bWasSuccessful)
             {
FString MessageBody = "";

// If HTTP fails client-side, this will still be called but with a NULL shared pointer!
if (!Response.IsValid())
{
	MessageBody = "{\"success\":\"Error: Unable to process HTTP Request!\"}";
}
else if (EHttpResponseCodes::IsOk(Response->GetResponseCode()))
{
	MessageBody = Response->GetContentAsString();

}
else
{
	MessageBody = FString::Printf(TEXT("{\"success\":\"HTTP Error: %d\"}"), Response->GetResponseCode());
}
ResponseStr = MessageBody;
GEngine->AddOnScreenDebugMessage(-1, 15.0f, FColor::Red, ResponseStr);
//Closed(MessageBody);
    }

I am getting the response string as NULL. Does anyone know the issue?

2

I am struggling with this too. HELP!!!

3

Any help related to this would help a lot!

4

Hi.

First - the question: What is CurrentRequest.AddURLPair() ? Is it your method? Is it doing something with http request?

Then - check if CurrentRequest.TheData has the data when you’re passing it to the SetContentAsString.

Also - try to change Content-Type that fits best your needs. Here is a list of possible Content-Types Typ MIME – Wikipedia, wolna encyklopedia (“text/plain” should be fine).

The final thing - check what packages you receive. Use Wireshark to check if there is a payload in response.

Also always check bWasSuccessful first.

The code looks fine to me, maybe there is a problem on the server side?

Oh and one more thing: Make sure that the server is responding using UTF8 and is zero terminated.

5

Thanks so much for replying back. AddURLPair basically allows you to add var and its value to the stream to send. So, I am receiving the data correctly on the website, exactly the way I want to. Now, to send a responce, all I am doing in the php script is echo “xyz”. I thought that was enough to send back a response from a php script. Is there something I am doing wrong at the php side?

6

Actually, the echo works. I was not receiving any response because I was calling the transmit on game exit. So, the getResponce function is running. Thanks guys.

7

I can see the problem is solved, but just as a reminder for future generations :wink:

  1. Always use UTF8 encoding. Remember to save all php files using UTF8 and set GET/SET to UTF8 (see mb_http_output function)
  2. Always use proper Content-Types - “text/plain” for plain text, “application/json” for jsons etc.
  3. Always check bWasSuccessful and validate the response.
8

Thanks for replying. I am new to php programming. I know that php sends the html page as response. Do you know a way I can send a plain text as echo?

9

http://docstore.mik.ua/orelly/webprog/php/ch07_05.htm
Try this.

10

HELLO,i try to use httprequest,but the php website receive nothing ,can you help me,please?
#include “hzl.h”
#include “Myphpconnection.h”

AMyphpconnection::AMyphpconnection(const class FPostConstructInitializeProperties& PCIP)
: Super(PCIP)
{
FString PostData = FString(TEXT(“{"Tname":”)) + FString(TEXT(“"4446545646544"”)) + TEXT(“}”);

TSharedRef<IHttpRequest> HttpRequest = FHttpModule::Get().CreateRequest();
//HttpRequest->SetHeader(TEXT("Content-Type"), TEXT("application/x-www-form-urlencoded"));
HttpRequest->SetHeader(TEXT("Content-Type"), TEXT("application/json"));
	HttpRequest->SetVerb("POST");
HttpRequest->SetURL(TEXT("http://localhost/index.php"));

HttpRequest->SetContentAsString(PostData);
HttpRequest->OnProcessRequestComplete().BindUObject(this, &AMyphpconnection::OnUpdateRequestComplete);

// HttpRequest->ProcessRequest();

if (!HttpRequest->ProcessRequest())
{
	if (GEngine)
	{
		GEngine->AddOnScreenDebugMessage(-1, 500.f, FColor::Yellow, FString::Printf(TEXT("%s"), *PostData));
		GEngine->AddOnScreenDebugMessage(1, 600.0f, FColor::Green, TEXT("Request failed at start!"));
	}
}
else
{
	if (GEngine)
	{
		GEngine->AddOnScreenDebugMessage(-1, 500.f, FColor::Yellow, FString::Printf(TEXT("%s"), *PostData));
		GEngine->AddOnScreenDebugMessage(1, 600.0f, FColor::Green, TEXT("Request successd at start!"));
	}
}/**/

}

void AMyphpconnection::OnUpdateRequestComplete(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bWasSuccessful)
{

}
11

HELLO,i try to use httprequest,but the php website receive nothing ,can you help me,please?

#include “hzl.h”
#include “Myphpconnection.h”

AMyphpconnection::AMyphpconnection(const class FPostConstructInitializeProperties& PCIP) : Super(PCIP) { FString PostData = FString(TEXT(“{"Tname":”)) + FString(TEXT(“"4446545646544"”)) + TEXT(“}”);

TSharedRef HttpRequest = FHttpModule::Get().CreateRequest();
//HttpRequest->SetHeader(TEXT(“Content-Type”), TEXT(“application/x-www-form-urlencoded”));
HttpRequest->SetHeader(TEXT(“Content-Type”), TEXT(“application/json”));
HttpRequest->SetVerb(“POST”);
HttpRequest->SetURL(TEXT(“http://localhost/index.php”));

HttpRequest->SetContentAsString(PostData);
HttpRequest->OnProcessRequestComplete().BindUObject(this, &AMyphpconnection::OnUpdateRequestComplete);
// HttpRequest->ProcessRequest();

if (!HttpRequest->ProcessRequest())
{
if (GEngine)
{
GEngine->AddOnScreenDebugMessage(-1, 500.f, FColor::Yellow, FString::Printf(TEXT(“%s”), *PostData));
GEngine->AddOnScreenDebugMessage(1, 600.0f, FColor::Green, TEXT(“Request failed at start!”));
}
}
else
{
if (GEngine)
{
GEngine->AddOnScreenDebugMessage(-1, 500.f, FColor::Yellow, FString::Printf(TEXT(“%s”), *PostData));
GEngine->AddOnScreenDebugMessage(1, 600.0f, FColor::Green, TEXT(“Request successd at start!”));
}
}/**/

}

void AMyphpconnection::OnUpdateRequestComplete(FHttpRequestPtr Request, FHttpResponsePtr Response, bool bWasSuccessful) {

}

12

look at the code above. I can confirm that it works perfectly. If you have any specific questions, shoot at me

13

I spent hours trying to figure out why my posting wasn’t working, but I changed to UTF-8 and suddenly it worked! I don’t know why, but it was on UCS-2… Thanks :slight_smile: