UGMPJsonHttpUtils

UGMPJsonHttpUtils

The HTTP NeuronAction GMP ships. Also the reference example of what a UK2NeuronAction looks like in source.

Declared in Plugins/GMP/Source/GMP/Private/GMPJsonUtils.h:60

DECLARE_DYNAMIC_DELEGATE_TwoParams(FGMPJsonResponseDelegate, bool, bSucc, int32, RspCode);

UCLASS(meta = (NeuronAction))
class UGMPJsonHttpUtils : public UBlueprintFunctionLibrary
{
    UFUNCTION(BlueprintCallable, CustomThunk, BlueprintInternalUseOnly,
              Category = "GMP|Json|HTTP",
              meta = (DisplayName = "GMPHttpPostRequest", NeuronAction, WorldContext = InCtx,
                      CustomStructureParam = "RequestStruct,ResponseStruct",
                      TimeoutSecs = "60", AutoCreateRefTerm = "Headers",
                      AdvancedDisplay = "Headers,TimeoutSecs"))
    static void HttpPostRequestWild(const UObject* InCtx, const FString& Url,
                                    const TMap<FString, FString>& Headers, float TimeoutSecs,
                                    const FGMPJsonResponseDelegate& OnHttpResponse,
                                    int32 ConvertFlags,
                                    const int32& RequestStruct, int32& ResponseStruct);
};

HttpGetRequestWild is the same shape without a request body.

The resulting node

Pin	From
Url, Convert Flags	ordinary parameters
Request Struct, Response Struct	CustomStructureParam — wildcards, typed by whatever you connect
Headers, Timeout Secs	AdvancedDisplay, collapsed by default
On Http Response + bSucc, RspCode	the delegate parameter, expanded into an exec pin with its data

The response is already decoded when the pin fires

ResponseStruct is a ref parameter. The implementation deserialises the response JSON into your struct and only then executes the delegate, so downstream of the exec pin the data is already there. No parsing node, and no proxy object to keep alive.

ConvertFlags

EEJsonEncodeMode is a bitmask controlling JSON encoding of the request: BoolAsBoolean, EnumAsStr, Int64AsStr, UInt64AsStr, OverflowAsStr, LowerStartCase, StandardizeID. The Int64AsStr and UInt64AsStr flags exist because JSON numbers cannot represent the full 64-bit range — set them when talking to a service that expects string-encoded ids.

C++ use

The template form takes typed request and response structs directly:

template<typename TReq, typename TRsp>
static void HttpPostRequestWild(const UObject* InCtx, const FString& Url,
                                const TMap<FString, FString>& Headers, const TReq& Req,
                                TDelegate<void(bool, int32, const TRsp&)> Rsp,
                                float TimeoutSecs = 60.f,
                                EEJsonEncodeMode ConvertFlags = EEJsonEncodeMode::Default);

See also

UK2NeuronAction · UK2Neuron · GMPArchive