traefik/docs/content/middlewares/http/grpcweb.md

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