67 lines
1.7 KiB
Markdown
67 lines
1.7 KiB
Markdown
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---
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title: "Traefik GrpcWeb Documentation"
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description: "In Traefik Proxy's HTTP middleware, GrpcWeb converts a gRPC Web requests to HTTP/2 gRPC requests. Read the technical documentation."
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---
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# GrpcWeb
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Converting gRPC Web requests to HTTP/2 gRPC requests.
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{: .subtitle }
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The GrpcWeb middleware converts gRPC Web requests to HTTP/2 gRPC requests before forwarding them to the backends.
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!!! tip
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Please note, that Traefik needs to communicate using gRPC with the backends (h2c or HTTP/2 over TLS).
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Check out the [gRPC](../../user-guides/grpc.md) user guide for more details.
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## Configuration Examples
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```yaml tab="Docker"
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labels:
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- "traefik.http.middlewares.test-grpcweb.grpcweb.allowOrigins=*"
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```
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```yaml tab="Kubernetes"
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apiVersion: traefik.containo.us/v1alpha1
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kind: Middleware
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metadata:
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name: test-grpcweb
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spec:
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grpcWeb:
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allowOrigins:
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- "*"
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```
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```yaml tab="Consul Catalog"
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- "traefik.http.middlewares.test-grpcweb.grpcWeb.allowOrigins=*"
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```
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```yaml tab="File (YAML)"
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http:
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middlewares:
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test-grpcweb:
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grpcWeb:
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allowOrigins:
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- "*"
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```
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```toml tab="File (TOML)"
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[http.middlewares]
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[http.middlewares.test-grpcweb.grpcWeb]
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allowOrigins = ["*"]
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```
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## Configuration Options
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### `allowOrigins`
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The `allowOrigins` contains the list of allowed origins.
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A wildcard origin `*` can also be configured to match all requests.
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More information including how to use the settings can be found at:
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- [Mozilla.org](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Origin)
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- [w3](https://fetch.spec.whatwg.org/#http-access-control-allow-origin)
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- [IETF](https://tools.ietf.org/html/rfc6454#section-7.1)
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