Railway•12mo ago

Sending http requests to new service

hey - I just deployed a service on railway & added a custom domain, from the deploy logs it looks like the application process is starting on & listening on 0.0.0.0:{PORT} (following https://docs.railway.app/deploy/exposing-your-app, using the railway provided env port for PORT. But sending external requests to the service on the /status health endpoint (that just returns a 200 status code and { "message": "OK" } does not work. There's a lot of in-between stuff that I'm wondering on - if I send a HTTP request to https://{HOST}/status I imagine that the request goes to port 443 then railway forwards that internally to the internal PORT...so my application should be picking it up. Everything works fine locally, just have this last small thing to work out on how packets are getting routed. Thanks

Solution:

swap to a foreground process, you generally want that when in a docker container anyway

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28 Replies

Percy•12mo ago

Project ID: 8f12a5b5-c874-4220-8712-b3709fa9bc73

bephrem•12mo ago

project id: 8f12a5b5-c874-4220-8712-b3709fa9bc73

bephrem•12mo ago

I wonder if there is a way I can enter a virtual shell to see what's going on but ik that the application is living in abstraction-world & maybe not possible to shell into anywhere maybe I need to give the PORT env variable a concrete value & proxy? (https://docs.railway.app/deploy/exposing-your-app#tcp-proxying) (or maybe I need to map 443 -> to a concrete PORT value) But I imagine the above isn't necessary - probably something im missing

Brody•12mo ago

is this just a plain http (not https) server?

bephrem•12mo ago

plain http

Brody•12mo ago

accepts http 1.1?

bephrem•12mo ago

not sure - checking looks like it does curl -I --http1.1 localhost:8080 HTTP/1.1 404 Not Found date: Thu, 09 Nov 2023 21:20:04 GMT server: uvicorn content-type: text/plain curl -I --http1.1 https://{...host-redacted...}/status HTTP/1.1 503 Service Unavailable content-type: text/html x-railway-fallback: true content-length: 2942 date: Thu, 09 Nov 2023 21:20:33 GMT server: railway

Brody•12mo ago

oh this is a uvicorn app?

bephrem•12mo ago

locally runs uvicorn let me grab listen()

Brody•12mo ago

on railway, are you starting uvicorn from within your code or from the command line?

bephrem•12mo ago

def listen():
    app_import_string = "src.server.core:app"

    if Environment.is_production() or Environment.is_staging():
        # background process
        args = [
            "gunicorn",
            app_import_string,
            "--workers",
            "1",
            "--worker-class",
            "uvicorn.workers.UvicornWorker",
            "--bind",
            f"{HOSTNAME}:{PORT}",
        ]
        logs_path = PathManager.service_logs_path()

        with open(logs_path, "w") as logs_file:
            subprocess.Popen(
                args, stdout=logs_file, stderr=STDOUT, text=True, encoding="utf-8"
            )

        logger.info(f"started server on {HOSTNAME}:{PORT}")
    else:
        # foreground process (for development)
        uvicorn.run(
            app=app_import_string,
            host=HOSTNAME,
            port=PORT,
            reload=True,
            log_level="info",
        )

def listen():
    app_import_string = "src.server.core:app"

    if Environment.is_production() or Environment.is_staging():
        # background process
        args = [
            "gunicorn",
            app_import_string,
            "--workers",
            "1",
            "--worker-class",
            "uvicorn.workers.UvicornWorker",
            "--bind",
            f"{HOSTNAME}:{PORT}",
        ]
        logs_path = PathManager.service_logs_path()

        with open(logs_path, "w") as logs_file:
            subprocess.Popen(
                args, stdout=logs_file, stderr=STDOUT, text=True, encoding="utf-8"
            )

        logger.info(f"started server on {HOSTNAME}:{PORT}")
    else:
        # foreground process (for development)
        uvicorn.run(
            app=app_import_string,
            host=HOSTNAME,
            port=PORT,
            reload=True,
            log_level="info",
        )

railway will run python3 main.py which triggers the above - all env variables resolve fine (Environment is a wrapper class where I do some processing)

Brody•12mo ago

background progress, maybe your app is exiting right after it starts

bephrem•12mo ago

hmmm good point

Solution

Brody•12mo ago

swap to a foreground process, you generally want that when in a docker container anyway

bephrem•12mo ago

does the driver process of railway expect a foreground process to keep the driver alive? noted. I imagine Railway is running a driver process spawning the child, and it is just seeing the child exit

Brody•12mo ago

railway is just docker containers, there's nothing super special going on

bephrem•12mo ago

i see so is the container shutting down? I'm less familiar with docker (hands-on)

Brody•12mo ago

what's the status of the deployment?

bephrem•12mo ago

failed (btw working on switching to foreground running)

Brody•12mo ago

oh well yeah lol forgot about the healthcheck haha let me know how that goes!

bephrem•12mo ago

sure - will update. ok - back, still refactoring (grabbed food)

bephrem•12mo ago

looks like we're good running in the foreground

def listen():
    app_import_string = "src.server.core:app"

    if Environment.is_production() or Environment.is_staging():
        # run gunicorn in the foreground (production)
        subprocess.run(
            (
                f"gunicorn {app_import_string} "
                f"--workers 1 "
                f"--worker-class uvicorn.workers.UvicornWorker "
                f"--bind {HOSTNAME}:{PORT} "
                f"--access-logfile - "  # '-' means log to stdout
                f"--error-logfile - "  # '-' means log to stderr
            ),
            shell=True,
            check=True,
        )

        logger.info(f"started server on {HOSTNAME}:{PORT}")
    else:
        # foreground uvicorn process (for development)
        uvicorn.run(
            app=app_import_string,
            host=HOSTNAME,
            port=PORT,
            reload=True,
            log_level="info",
        )

def listen():
    app_import_string = "src.server.core:app"

    if Environment.is_production() or Environment.is_staging():
        # run gunicorn in the foreground (production)
        subprocess.run(
            (
                f"gunicorn {app_import_string} "
                f"--workers 1 "
                f"--worker-class uvicorn.workers.UvicornWorker "
                f"--bind {HOSTNAME}:{PORT} "
                f"--access-logfile - "  # '-' means log to stdout
                f"--error-logfile - "  # '-' means log to stderr
            ),
            shell=True,
            check=True,
        )

        logger.info(f"started server on {HOSTNAME}:{PORT}")
    else:
        # foreground uvicorn process (for development)
        uvicorn.run(
            app=app_import_string,
            host=HOSTNAME,
            port=PORT,
            reload=True,
            log_level="info",
        )

Brody•12mo ago

awsome, glad you could solve this!

bephrem•12mo ago

Gaming

Programming

Sending http requests to new service