Get the request body of post or get in request

[mingtiandemeng]

I can get the request body of the post method in Flask in this way

    data = request.data
   # method post
    if data:
        logger.debug('data   %s', data)

    # method get
    args = request.args or {}
    if args:
        logger.debug('args   %s', args)

    form_data = request.form

    if form_data:
        logger.debug('form   %s', form_data)

I can also get the request parameters of the get method in the flash API in the following way

    scope = request.scope
    query_string = scope.get("query_string")

But I can't find the body in the FastAPI post

What should I do？thanks

[Mause]

Please consult the documentation: https://fastapi.tiangolo.com/tutorial/body/

[klaa97]

The FastAPI documentation covers how to get the body with FastAPI parameters (and dependencies).

It's also possible to get the Request body (as JSON, form, etc) directly in your method operation (although you won't have automatic documentation); to do so, refer to:

• https://www.starlette.io/requests/#body
• https://fastapi.tiangolo.com/advanced/using-request-directly/

[mingtiandemeng]

FastAPI文档介绍了如何使用FastAPI参数（和依赖项）获取主体。

也可以在您的方法操作中直接获取Request body（如JSON，form等）（尽管您不会获得自动文档）；为此，请参考：

• https://www.starlette.io/requests/#body
• https://fastapi.tiangolo.com/advanced/using-request-direct/

Can this be implemented in middleware

[mingtiandemeng]

FastAPI文档介绍了如何使用FastAPI参数（和依赖项）获取主体。
也可以在您的方法操作中直接获取Request body（如JSON，form等）（尽管您不会获得自动文档）；为此，请参考：

• https://www.starlette.io/requests/#body
• https://fastapi.tiangolo.com/advanced/using-request-direct/

Can this be implemented in middleware

@app.middleware("http")
async def add_process_time_header(request: Request, call_next):
    start_time = time.time()
    logger_header = format_request_logger_header(request)
    logger.info(f"{logger_header} Request Begin")
    logger.info(f"{logger_header} query_params {request.query_params}")
    response = await call_next(request)


    jn =  await request.json()
    logger.debug(jn)
    logger.debug('*'*100)
    
    process_time = time.time() - start_time
    response.headers["X-Process-Time"] = str(process_time)
    logger.info(f'{logger_header} Request End time_used {process_time}')

    return response

What's wrong with this? When I got to the point of getting JSON, the program got stuck. Can't get the data in JSON

[mingtiandemeng]

请查阅文档：https : //fastapi.tiangolo.com/tutorial/body/

Please consult the documentation: https://fastapi.tiangolo.com/tutorial/body/

You can take a look at my chat with klaa97, which has the troubles I'm facing now. Thank you.

[klaa97]

FastAPI文档介绍了如何使用FastAPI参数（和依赖项）获取主体。
也可以在您的方法操作中直接获取Request body（如JSON，form等）（尽管您不会获得自动文档）；为此，请参考：

• https://www.starlette.io/requests/#body
• https://fastapi.tiangolo.com/advanced/using-request-direct/

Can this be implemented in middleware

@app.middleware("http")
async def add_process_time_header(request: Request, call_next):
    start_time = time.time()
    logger_header = format_request_logger_header(request)
    logger.info(f"{logger_header} Request Begin")
    logger.info(f"{logger_header} query_params {request.query_params}")
    response = await call_next(request)


    jn =  await request.json()
    logger.debug(jn)
    logger.debug('*'*100)
    
    process_time = time.time() - start_time
    response.headers["X-Process-Time"] = str(process_time)
    logger.info(f'{logger_header} Request End time_used {process_time}')

    return response

What's wrong with this? When I got to the point of getting JSON, the program got stuck. Can't get the data in JSON

The problem is due to a known "issue" or design choice in Starlette (check the related issue here for more details): consuming the request body in a ASGI Middleware is problematic, therefore I suggest you to check out this doc: https://fastapi.tiangolo.com/advanced/custom-request-and-route/#custom-apiroute-class-in-a-router ; by using a custom APIRoute class, it will possible to retrieve the request body (since you'll have the same interface as in a standard path operation)

[mingtiandemeng]

FastAPI文档介绍了如何使用FastAPI参数（和依赖项）获取主体。
也可以在您的方法操作中直接获取Request body（如JSON，form等）（尽管您不会获得自动文档）；为此，请参考：

• https://www.starlette.io/requests/#body
• https://fastapi.tiangolo.com/advanced/using-request-direct/

Can this be implemented in middleware

@app.middleware("http")
async def add_process_time_header(request: Request, call_next):
    start_time = time.time()
    logger_header = format_request_logger_header(request)
    logger.info(f"{logger_header} Request Begin")
    logger.info(f"{logger_header} query_params {request.query_params}")
    response = await call_next(request)


    jn =  await request.json()
    logger.debug(jn)
    logger.debug('*'*100)
    
    process_time = time.time() - start_time
    response.headers["X-Process-Time"] = str(process_time)
    logger.info(f'{logger_header} Request End time_used {process_time}')

    return response

What's wrong with this? When I got to the point of getting JSON, the program got stuck. Can't get the data in JSON

The problem is due to a known "issue" or design choice in Starlette (check the related issue here for more details): consuming the request body in a ASGI Middleware is problematic, therefore I suggest you to check out this doc: https://fastapi.tiangolo.com/advanced/custom-request-and-route/#custom-apiroute-class-in-a-router ; by using a custom APIRoute class, it will possible to retrieve the request body (since you'll have the same interface as in a standard path operation)

thanks

[klaa97]

Feel free to close the issue if resolved 👍

[tiangolo]

Thanks for the help here @klaa97 and @Mause ! 👏 🙇

Thanks for reporting back and closing the issue @mingtiandemeng 👍

Sorry for the long delay! 🙈 I wanted to personally address each issue/PR and they piled up through time, but now I'm checking each one in order.