Host grpc service in iis or as an app service?

[moodya]

Aug 2022 Update

• gRPC is supported in IIS and Http.Sys locally on Windows 11 and Windows Server 2022
• gRPC is supported on App Service for Linux
• gRPC is supported on App Service for Containers
• gRPC is NOT supported on App Service for Windows

You can use this issue to track app service progress and follow up about gRPC on app service for Windows.

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Original issue:

Is it possible to do this? If so how?

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2022/08/18 Update - @JamesNK

Available in most regions: https://azure.github.io/AppService/2022/08/16/A-Heavy-Lift.html 🥳

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2022/05/23 Update - @JamesNK

Azure App Service supports gRPC (preview): https://azure.github.io/AppService/2022/05/23/gRPC-support-on-App-Service.html 🎉

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2021/12/16 Update - @JamesNK

User voice issue

There is a Microsoft Azure user voice issue for adding gRPC support to App Service. Consider voting if this is an important feature for you.

Azure no longer uses user voice.

2020/10/28 Update - @JamesNK

User voice issue

There is a Microsoft Azure user voice issue for adding gRPC support to App Service. Consider voting if this is an important feature for you.

Azure no longer uses user voice.

gRPC-Web

gRPC-Web with .NET is now available. gRPC-Web is compatible with IIS and Azure App Service. Link to blog post with more info: https://devblogs.microsoft.com/aspnet/grpc-web-for-net-now-available/

IIS

IIS is supported with .NET 5 and an insiders build of Windows. More info: #9020 (comment)

[Eilon]

Hi @moodya , have you checked out the docs at https://docs.microsoft.com/en-us/aspnet/core/tutorials/grpc/grpc-start?view=aspnetcore-3.0&tabs=visual-studio ?

If you're running into a problem, please let us know and we can investigate.

[moodya]

Yeah I've already built a service that's running as a generic hosted service. I've ported it to the new asp net core 3 template and got it working running on self hosted kestrel, but currently looking at hosting it behind iis and hopefully deploying it as an app service in Azure. I can't get the former (iis) to work. Get Outlook for Android<https://aka.ms/ghei36>

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________________________________ From: Eilon Lipton <notifications@github.com> Sent: Wednesday, April 3, 2019 6:06:17 PM To: aspnet/AspNetCore Cc: moodya; Mention Subject: Re: [aspnet/AspNetCore] Host grpc service in iis or as an app service? (#9020) Hi @moodya<https://github.com/moodya> , have you checked out the docs at https://docs.microsoft.com/en-us/aspnet/core/tutorials/grpc/grpc-start?view=aspnetcore-3.0&tabs=visual-studio ? If you're running into a problem, please let us know and we can investigate. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub<#9020 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AlUvPONL4H1tZ-pHOakDspdkXLLgThWbks5vdN-JgaJpZM4cZ2SG>.

[moodya]

I can't find any examples of how to do this, so maybe it's not supported yet Get Outlook for Android<https://aka.ms/ghei36>

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________________________________ From: Alain Moody <alainmoody@hotmail.com> Sent: Wednesday, April 3, 2019 6:11:06 PM To: aspnet/AspNetCore; aspnet/AspNetCore Cc: Mention Subject: Re: [aspnet/AspNetCore] Host grpc service in iis or as an app service? (#9020) Yeah I've already built a service that's running as a generic hosted service. I've ported it to the new asp net core 3 template and got it working running on self hosted kestrel, but currently looking at hosting it behind iis and hopefully deploying it as an app service in Azure. I can't get the former (iis) to work. Get Outlook for Android<https://aka.ms/ghei36>

________________________________ From: Eilon Lipton <notifications@github.com> Sent: Wednesday, April 3, 2019 6:06:17 PM To: aspnet/AspNetCore Cc: moodya; Mention Subject: Re: [aspnet/AspNetCore] Host grpc service in iis or as an app service? (#9020) Hi @moodya<https://github.com/moodya> , have you checked out the docs at https://docs.microsoft.com/en-us/aspnet/core/tutorials/grpc/grpc-start?view=aspnetcore-3.0&tabs=visual-studio ? If you're running into a problem, please let us know and we can investigate. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub<#9020 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AlUvPONL4H1tZ-pHOakDspdkXLLgThWbks5vdN-JgaJpZM4cZ2SG>.

[Eilon]

@shirhatti - any idea on this?

[shirhatti]

Can't host gRPC in IIS/Azure App Service.
The HTTP/2 implementation of Http.Sys does not support HTTP response trailing headers which gRPC relies on.

[moodya]

Thanks for the prompt response. How would you recommend hosting a grpc service in a production scenario at the moment? Also, are you aware of any timescales when a grpc service will be host-able on iis / app service? Get Outlook for Android<https://aka.ms/ghei36>

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________________________________ From: Sourabh Shirhatti <notifications@github.com> Sent: Wednesday, April 3, 2019 7:13:23 PM To: aspnet/AspNetCore Cc: moodya; Mention Subject: Re: [aspnet/AspNetCore] Host grpc service in iis or as an app service? (#9020) Can't host gRPC in IIS/Azure App Service. The HTTP/2 implementation of Http.Sys does not support HTTP response trailing headers which gRPC relies on. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub<#9020 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AlUvPNHH4-HhNsSAtugTw0MzzNco6c76ks5vdO9DgaJpZM4cZ2SG>.

[shirhatti]

The recommended approach is to host your gRPC service on AKS.

As far as App Service timelines go, I'd defer to @stefsch

[moodya]

Thanks for getting back to me. In terms of aks Vs service fabric in terms of hosting the grpc service is aks the better choice? If so, why? Get Outlook for Android<https://aka.ms/ghei36>

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________________________________ From: Sourabh Shirhatti <notifications@github.com> Sent: Monday, April 8, 2019 7:31:45 AM To: aspnet/AspNetCore Cc: moodya; Mention Subject: Re: [aspnet/AspNetCore] Host grpc service in iis or as an app service? (#9020) The recommended approach is to host your gRPC service on AKS. As far as App Service timelines go, I'd defer to @stefsch<https://github.com/stefsch> — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub<#9020 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AlUvPLwQW8HCp-YXsz6yNaK_RH7jbZzWks5veuJRgaJpZM4cZ2SG>.

[alustrement]

I'm currently expecting issues to do this. I got a gRPC service running well using aspnetcore 3 preview 3 and Kestrel. But, an error about trailers appears using IIS when the service send the response (the request is well received) :
gPRC error => 2 UNKNOWN: No status received)
Dotnet error => "Trailers are not supported for this response" in Microsoft.AspNetCore.Http.ResponseTrailerExtensions.AppendTrailer(HttpResponse response, String trailerName, StringValues trailerValues) at Grpc.AspNetCore.Server.Internal.HttpResponseExtensions.ConsolidateTrailers...

[moodya]

As per messages above don't think iis supports hosting a grpc service Get Outlook for Android<https://aka.ms/ghei36>

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________________________________ From: alustrement <notifications@github.com> Sent: Thursday, April 25, 2019 10:57:42 AM To: aspnet/AspNetCore Cc: moodya; Mention Subject: Re: [aspnet/AspNetCore] Host grpc service in iis or as an app service? (#9020) I'm currently expecting issues to do this. I got a gRPC service running well using aspnetcore 3 preview 3 and Kestrel. But, an error about trailers appears using IIS when the service send the response (the request is well received) : gPRC error => 2 UNKNOWN: No status received) Dotnet error => "Trailers are not supported for this response" in Microsoft.AspNetCore.Http.ResponseTrailerExtensions.AppendTrailer(HttpResponse response, String trailerName, StringValues trailerValues) at Grpc.AspNetCore.Server.Internal.HttpResponseExtensions.ConsolidateTrailers... — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub<#9020 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AJKS6PEAJ2UKKH2QIKNTCZDPSF6BNANCNFSM4HDHMSDA>.

[alustrement]

Following this exchange https://forums.iis.net/p/1241598/2147837.aspx?p=True&t=636917571046786374, it seems that is not the responsibilty of the web server to handle gRPC. gPRC use HTTP/2, IIS supports HTTP/2, so it must works. If it's not, it's a bug from IIS or, more possible, from dotnetcore.