Creating a ApiProxy using Micronaut

[rafael-coelho-amaro]

Hi,

Any one know how to create a ApiGateway using Micronaut? I'm trying to forward all Calls for this URI "/fromeverycall/**" format to other server.

I try to use DefaultHttpClient from micronaut-http-client, but it return a convert error ("cannot be cast to class io.micronaut.http.MutableHttpRequest").

package com.rafael.gateway.controllers

import com.rafael.configs.GatewayConfig
import io.micronaut.http.HttpRequest
import io.micronaut.http.MutableHttpResponse
import io.micronaut.http.annotation.Filter
import io.micronaut.http.client.netty.DefaultHttpClient
import io.micronaut.http.filter.OncePerRequestHttpServerFilter
import io.micronaut.http.filter.ServerFilterChain
import org.reactivestreams.Publisher
import org.slf4j.LoggerFactory
import java.net.URL

@Filter("/fromeverycall/**")
class ProxyFilter(val gatewayConfig: GatewayConfig) : OncePerRequestHttpServerFilter() {
    private val LOG = LoggerFactory.getLogger(ProxyFilter::class.java)

    private val client : DefaultHttpClient = DefaultHttpClient(
            URL("https://%s/".replace("%s", gatewayConfig.urn!!))
    )

    override fun doFilterOnce(request: HttpRequest<*>?, chain: ServerFilterChain?): Publisher<MutableHttpResponse<*>> {
        return client.proxy(request)
    }
}

If anyone knows how to create a ApiGateway using micronaut framework, please tell me.

[rferreira]

You probably don't want a filter but a controller that just calls the upstream service using a http client returning the payload to the client.

[graemerocher]

You need to call request.mutate() and modify the URI that way