Getting Unexpected end of request content error in HTTPStarter based azure durable function app

Question

Getting Unexpected end of request content error in HTTPStarter based azure durable function app

Nirali Shah 151

18 Mar 2025, 12:06 pm

We have created a HTTPStarter based azure durable function app. In this, we are getting 499 (Unexpected end of request content) error frequently between the successful executions.

When request is sent to the function app via webhook it results in error sometime where only 1 error log is available suggesting "Unexpected end of request content."

Function app is implemented in python and we have added the try-except block but no log is coming from there, so the exception is thrown by the function runtime as it is decoding it for the http-trigger.

FYI, The function app is running on a Linux Consumption plan.

Can anyone suggest the solution for this or any workaround to avoid the 499 error?

Nirali Shah 151 Reputation points

19 Mar 2025, 9:38 am

Attaching the error screenshot for the reference:
Pravallika Kothaveeranna Gari 320 Reputation points Microsoft External Staff

26 Mar 2025, 10:20 am

Hi Nirali Shah Provide your function code snippet if possible (exclude sensitive information if you have any)
Pravallika Kothaveeranna Gari 320 Reputation points Microsoft External Staff

27 Mar 2025, 3:42 am

Nirali Shah, Just checking in to see if the issue is resolved. If not, please provide more details along with your function code to check further.

Nirali Shah 151

27 Mar 2025, 1:33 pm

def get_data_from_request_body(request):
    """Get data from request body.

    Args:
        request (func.HttpRequest): Azure function HttpRequest class object

    """
    __method_name = inspect.currentframe().f_code.co_name
    try:
        data = request.get_json()
        json_data = json.dumps(data)
        return json_data
    except ValueError as value_error:
        applogger.error("{}(method={}) {}".format(LOGS_STARTS_WITH, __method_name, value_error))
    except Exception as err:
        applogger.error("{}(method={}) {}".format(LOGS_STARTS_WITH, __method_name, err))


async def main(req: func.HttpRequest, starter: str) -> func.HttpResponse:
    """
    Start the execution.

    Args:
        req (func.HttpRequest): To get data from request body pushed by webhook

    Returns:
        func.HttpResponse: Status of Http request process (successful/failed).
    """
    __method_name = inspect.currentframe().f_code.co_name
    try:
        applogger.debug("{} HttpStarter Function Called.".format(LOGS_STARTS_WITH))
        data = get_data_from_request_body(req)
        if data:
            client = df.DurableOrchestrationClient(starter)
            instance_id = await client.start_new(
                req.route_params["functionName"], client_input=data
            )
            applogger.info(
                "{} Started orchestration with ID = '{}'.".format(
                    LOGS_STARTS_WITH, instance_id
                )
            )
            body = "Data Received successfully via Webhook."
            return func.HttpResponse(
                body=body,
                status_code=200,
                headers={"Content-Length": str(len(body))},
            )
        else:
            applogger.info("{}(method={})No required data found.".format(LOGS_STARTS_WITH, __method_name))
            body = "No required data found."
            return func.HttpResponse(
                body=body,
                status_code=202,
                headers={"Content-Length": str(len(body))},
            )
    except Exception as err:
        body = "Error: {}".format(err)
        return func.HttpResponse(
            body=body,
            status_code=400,
            headers={"Content-Length": str(len(body))},
        )

Your answer

Nirali Shah 151 Reputation points

19 Mar 2025, 9:38 am

Attaching the error screenshot for the reference:
Pravallika Kothaveeranna Gari 320 Reputation points Microsoft External Staff

26 Mar 2025, 10:20 am

Hi Nirali Shah Provide your function code snippet if possible (exclude sensitive information if you have any)
Pravallika Kothaveeranna Gari 320 Reputation points Microsoft External Staff

27 Mar 2025, 3:42 am

Nirali Shah, Just checking in to see if the issue is resolved. If not, please provide more details along with your function code to check further.
Nirali Shah 151 Reputation points

27 Mar 2025, 1:33 pm

def get_data_from_request_body(request): """Get data from request body. Args: request (func.HttpRequest): Azure function HttpRequest class object """ __method_name = inspect.currentframe().f_code.co_name try: data = request.get_json() json_data = json.dumps(data) return json_data except ValueError as value_error: applogger.error("{}(method={}) {}".format(LOGS_STARTS_WITH, __method_name, value_error)) except Exception as err: applogger.error("{}(method={}) {}".format(LOGS_STARTS_WITH, __method_name, err)) async def main(req: func.HttpRequest, starter: str) -> func.HttpResponse: """ Start the execution. Args: req (func.HttpRequest): To get data from request body pushed by webhook Returns: func.HttpResponse: Status of Http request process (successful/failed). """ __method_name = inspect.currentframe().f_code.co_name try: applogger.debug("{} HttpStarter Function Called.".format(LOGS_STARTS_WITH)) data = get_data_from_request_body(req) if data: client = df.DurableOrchestrationClient(starter) instance_id = await client.start_new( req.route_params["functionName"], client_input=data ) applogger.info( "{} Started orchestration with ID = '{}'.".format( LOGS_STARTS_WITH, instance_id ) ) body = "Data Received successfully via Webhook." return func.HttpResponse( body=body, status_code=200, headers={"Content-Length": str(len(body))}, ) else: applogger.info("{}(method={})No required data found.".format(LOGS_STARTS_WITH, __method_name)) body = "No required data found." return func.HttpResponse( body=body, status_code=202, headers={"Content-Length": str(len(body))}, ) except Exception as err: body = "Error: {}".format(err) return func.HttpResponse( body=body, status_code=400, headers={"Content-Length": str(len(body))}, )

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Getting Unexpected end of request content error in HTTPStarter based azure durable function app

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