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grpc-web

docs/en/latest/plugins/grpc-web.md

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Description

The grpc-web Plugin is a proxy Plugin that can process gRPC Web requests from JavaScript clients to a gRPC service.

Attributes

NameTypeRequiredDefaultDescription
cors_allow_headersstringFalse"content-type,x-grpc-web,x-user-agent"Headers in the request allowed when accessing a cross-origin resource. Use , to add multiple headers.

Enable Plugin

You can enable the grpc-web Plugin on a specific Route as shown below:

:::note You can fetch the admin_key from config.yaml and save to an environment variable with the following command:

bash
admin_key=$(yq '.deployment.admin.admin_key[0].key' conf/config.yaml | sed 's/"//g')

:::

shell
curl http://127.0.0.1:9180/apisix/admin/routes/1 -H "X-API-KEY: $admin_key" -X PUT -d '
{
    "uri":"/grpc/web/*",
    "plugins":{
        "grpc-web":{}
    },
    "upstream":{
        "scheme":"grpc",
        "type":"roundrobin",
        "nodes":{
            "127.0.0.1:1980":1
        }
    }
}'

Example usage

Refer to gRPC-Web Client Runtime Library or Apache APISIX gRPC Web Test Framework to learn how to setup your web client.

Once you have your gRPC Web client running, you can make a request to APISIX from the browser or through Node.js.

:::note

The supported request methods are POST and OPTIONS. See CORS support.

The supported Content-Type includes application/grpc-web, application/grpc-web-text, application/grpc-web+proto, and application/grpc-web-text+proto. See Protocol differences vs gRPC over HTTP2.

:::

Delete Plugin

To remove the grpc-web Plugin, you can delete the corresponding JSON configuration from the Plugin configuration. APISIX will automatically reload and you do not have to restart for this to take effect.

shell
curl http://127.0.0.1:9180/apisix/admin/routes/1 -H "X-API-KEY: $admin_key" -X PUT -d '
{
    "uri":"/grpc/web/*",
    "plugins":{},
    "upstream":{
        "scheme":"grpc",
        "type":"roundrobin",
        "nodes":{
            "127.0.0.1:1980":1
        }
    }
}'