How can I use FastAPI in IIS?

[visualnetpr]

Any way for FastAPI to work directly in IIS.

[igormorgado]

Really, are you a troll?

[visualnetpr]

Nop

[yezz123]

Any way for FastAPI to work directly in IIS.

If we talk about the experience using IIS right now to deploy an Application is bad, and we see the developer experience is bad while using IIS, not like these new servers (Term of performance Linux servers are much better than Windows servers), but if want you could try to see if he support the ASGI Servers first and if uvicorn or starlette support the configuration of your IIS Server.

I use it once in a Django Project I found this repo https://github.com/mjkillough/iis-asgi-handler that's helped me a lot to handle the ASGI Server.
You can try to see if this can perform or have a similar server config, or maybe you could switch to azure at least, cause IIS how we see is dead and not a secure anymore service to use it

[INTzRct]

Yes !, You can.
Because i already deploy FastAPI on IIS.

[jusce17]

Thank @RachataOutlier ,
is there a way to extend --timeout-keep-alive ?

[KamalBalah]

First of all please see this article https://medium.com/nonstopio/deploy-django-application-on-windows-iis-server-93aee2864c41 for know how to run Python on IIS

Step 2: run command in your venv pip install a2wsgi

and

in main.py `from fastapi import FastAPI from a2wsgi import ASGIMiddleware

app = FastAPI()

@app.get("/") def read_main(): return {"message": "Hello World"}

wsgi_app = ASGIMiddleware(app)`

Step 3: in web.config <?xml version="1.0" encoding="UTF-8"?> <configuration> <system.webServer> <handlers> <add name="FastAPI Handler" path="*" verb="*" modules="FastCgiModule" scriptProcessor="C:\inetpub\wwwroot\yourproject\yourvenv\Scripts\python.exe|C:\inetpub\wwwroot\yourproject\yourvenv\Lib\site-packages\wfastcgi.py" resourceType="Unspecified" /> </handlers> </system.webServer> <appSettings> <add key="PYTHONPATH" value="C:\inetpub\wwwroot\yourproject"/> <add key="WSGI_HANDLER" value="main.wsgi_app" /> </appSettings> </configuration>

please where can i found web.config file

[KamalBalah]

Yes !, You can. Because i already deploy FastAPI on IIS.

how to deploy on IIS please help

[jusce17]

@PowerRyder I followed these steps

[IgorSantRocha]

É só criar um no diretório do seu projeto:

C:\inetpub\wwwroot\TesteFastAPI\web.config

[nmol2]

I found these two articles that Helped me

(https://docs.microsoft.com/en-us/visualstudio/python/configure-web-apps-for-iis-windows?view=vs-2019)
The first one recommending httpPlatformHandler in ISS for running Python Web Apps.

https://stackoverflow.com/questions/61919424/how-to-run-windows-iis-on-top-of-an-asgi-server-like-hypercorn-or-uvicorn
this second one shows how to use httpPlatformHandler for FastAPI specifically.

(there may be a chance that 'httpPlatformHandler' may not be present in your system, then download and install it via 'Microsoft Web Platform Installer' available under Management Section on your IIS screen of respective Website.

i have used hypercorn (alternative of unicorn suggested on the official fastapi website)
pip install hypercorn

web.config

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <system.webServer>
     
        <handlers>
            <add name="httpPlatformHandler" path="*" verb="*" modules="httpPlatformHandler" resourceType="Unspecified" />
        </handlers>
        <httpPlatform processPath="C:\nmol\hpt-api\venv\Scripts\python.exe"
                    arguments="-m hypercorn app.main:app -b 127.0.0.1:%HTTP_PLATFORM_PORT% --keep-alive 5 --worker-class asyncio --workers 4"
                    stdoutLogEnabled="true" 
                    stdoutLogFile="C:\nmol\hpt-api\logs\python-stdout.log" 
                    startupTimeLimit="120" 
                    requestTimeout="00:05:00" 
                    startupRetryCount="3"
					processesPerApplication="5">
            <environmentVariables>
                <environmentVariable name="PORT" value="%HTTP_PLATFORM_PORT%" />
                
            </environmentVariables>
        </httpPlatform>
    </system.webServer>
</configuration>

(replace mentioned paths according to yours)

may this will work for you too

[IgorSantRocha]

Resolvi mudando processesPerApplication="5" para "processesPerApplication="1".

Agora somente os 4 workers são gerados. Mas caso essa não seja uma boa solução. Adoraria saber!

[IgorSantRocha]

Sobre o erro 404, eu só consegui resolver ao criar um ambiente virtual e pedir para usar o python do ambiente:

processPath="C:\inetpub\wwwroot\MyAPP\venv\Scripts\python.exe"

[lextm]

The answer has several problems,

1. The steps are over-complicated and contain duplicate or useless settings.
2. No troubleshooting hints were provided.

I have a much simpler version on my blog https://docs.lextudio.com/blog/running-fastapi-web-apps-on-iis-with-httpplatformhandler/

[jstoppa]

I tried the steps suggested here but I get the error

PermissionError: [WinError 10013] An attempt was made to access a socket in a way forbidden by its access permissions

Did anyone have this issue?

My web.config is the following

<?xml version="1.0" encoding="utf-8"?>
<configuration>
    <system.webServer>
        <handlers accessPolicy="Read, Execute, Script">
            <remove name="httpPlatformHandler"/>
            <add name="httpPlatformHandler" path="*" verb="*" modules="httpPlatformHandler" resourceType="Unspecified" />
        </handlers>
        <httpPlatform processPath="C:\inetpub\wwwroot\FastAPI\Scripts\python.exe"
            arguments="-m hypercorn app.main:app --bind 127.0.0.1:8080 --keep-alive 5 --worker-class asyncio --workers 4"
            stdoutLogEnabled="true" stdoutLogFile="C:\logs\python.log" startupTimeLimit="120" requestTimeout="00:05:00"
            startupRetryCount="3" processesPerApplication="1">
        </httpPlatform>
        <httpErrors errorMode="Detailed" />
    </system.webServer>
</configuration>

If I stop IIS and I run the command below it works fine, it's only when running it inside IIS.

C:\inetpub\wwwroot\FastAPI\Scripts\python.exe -m hypercorn app.main:app --bind 127.0.0.1:8080 --keep-alive 5 --worker-class asyncio --workers 4

I also tried to grant IIS_IUSRS access to python.exe but it didn't make any difference, it was suggested in this post as when calling the API it hangs forever

I suspect it's something to do with the IIS port binding, if I change the web.config to point at another port (e.g. 8000) different than the binding port in IIS then I'm able to access the API (e.g. by navigating to http://localhost:8000), it feels to me IIS is using the port when hypercorn is trying to use it

[jstoppa]

I managed to get it working using uvicorn rather than hypercorn following the steps in this blog
https://docs.lextudio.com/blog/running-fastapi-web-apps-on-iis-with-httpplatformhandler/

[oktaydbk54]

Hello, I wrote a code with FastAPI, I am trying to publish it on IIS, but my FastCGI option does not appear on the server, otherwise I would be very happy if you could help me to publish it.

[noahabe]

I don't know about deployment on IIS, but if you want to read more about deployment of a FastAPI project here you go: https://fastapi.tiangolo.com/deployment/