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gRPC-Web with bidirectional streaming on IIS/Azure (#19012)

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James Newton-King 2020-06-30 23:23:08 +12:00 committed by GitHub
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aspnetcore/grpc/browser.md
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@ -4,7 +4,7 @@ author: jamesnk
description: Learn how to configure gRPC services on ASP.NET Core to be callable from browser apps using gRPC-Web.
monikerRange: '>= aspnetcore-3.0'
ms.author: jamesnk
ms.date: 06/29/2020
ms.date: 06/30/2020
no-loc: [Blazor, "Blazor Server", "Blazor WebAssembly", "Identity", "Let's Encrypt", Razor, SignalR]
uid: grpc/browser
---
@ -67,6 +67,15 @@ The preceding code:
* Calls `UseCors` to add the CORS middleware after routing and before endpoints.
* Specifies the `endpoints.MapGrpcService<GreeterService>()` method supports CORS with `RequiresCors`.
### gRPC-Web and streaming
Traditional gRPC over HTTP/2 supports streaming in all directions. gRPC-Web offers limited support for streaming:
* gRPC-Web browser clients don't support calling client streaming and bidirectional streaming methods.
* ASP.NET Core gRPC services hosted on Azure App Service and IIS don't support bidirectional streaming.
When using gRPC-Web, we only recommend the use of unary methods and server streaming methods.
## Call gRPC-Web from the browser
Browser apps can use gRPC-Web to call gRPC services. There are some requirements and limitations when calling gRPC services with gRPC-Web from the browser: