feat(proxy-backend): more proxy config tweaks and docs

packages/backend/src/index.ts

@@ -82,7 +82,7 @@ async function main() {
     .addRouter('/auth', await auth(authEnv))
     .addRouter('/identity', await identity(identityEnv))
     .addRouter('/techdocs', await techdocs(techdocsEnv))
-    .addRouter('/proxy', await proxy(proxyEnv))
+    .addRouter('/proxy', await proxy(proxyEnv, '/proxy'))
     .addRouter('/graphql', await graphql(graphqlEnv));
 
   await service.start().catch(err => {

packages/backend/src/plugins/proxy.ts

@@ -13,13 +13,14 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 // @ts-ignore
 import { createRouter } from '@backstage/plugin-proxy-backend';
 import { PluginEnvironment } from '../types';
 
-export default async function createPlugin({
-  logger,
-  config,
-}: PluginEnvironment) {
-  return await createRouter({ logger, config });
+export default async function createPlugin(
+  { logger, config }: PluginEnvironment,
+  pathPrefix: string,
+) {
+  return await createRouter({ logger, config, pathPrefix });
 }