address pr comments

examples/server/ktor-server/src/main/kotlin/com/expediagroup/graphql/examples/server/ktor/GraphQLModule.kt

@@ -47,12 +47,7 @@ fun Application.graphQLModule() {
         contentConverter = JacksonWebsocketContentConverter()
     }
     install(StatusPages) {
-        exception<Throwable> { call, cause ->
-            when (cause) {
-                is UnsupportedOperationException -> call.respond(HttpStatusCode.MethodNotAllowed)
-                else -> call.respond(HttpStatusCode.BadRequest)
-            }
-        }
+        defaultGraphQLStatusPages()
     }
     install(CORS) {
         anyHost()

servers/graphql-kotlin-ktor-server/build.gradle.kts

@@ -11,6 +11,7 @@ dependencies {
     api(libs.ktor.server.core)
     api(libs.ktor.server.content)
     api(libs.ktor.server.websockets)
+    api(libs.ktor.server.statuspages)
     testImplementation(libs.kotlinx.coroutines.test)
     testImplementation(libs.ktor.client.content)
     testImplementation(libs.ktor.client.websockets)

servers/graphql-kotlin-ktor-server/src/main/kotlin/com/expediagroup/graphql/server/ktor/GraphQLStatusPages.kt

@@ -0,0 +1,13 @@
+package com.expediagroup.graphql.server.ktor
+
+import io.ktor.http.HttpStatusCode
+import io.ktor.server.plugins.statuspages.StatusPagesConfig
+import io.ktor.server.response.respond
+
+fun StatusPagesConfig.defaultGraphQLStatusPages(): StatusPagesConfig {
+    exception<Throwable> { call, cause ->
+        when (cause) {
+            is UnsupportedOperationException -> call.respond(HttpStatusCode.MethodNotAllowed)
+            else -> call.respond(HttpStatusCode.BadRequest) } }
+    return this
+}

servers/graphql-kotlin-ktor-server/src/test/kotlin/com/expediagroup/graphql/server/ktor/GraphQLPluginTest.kt

@@ -182,7 +182,17 @@ class GraphQLPluginTest {
     }
 
     @Test
-    fun `server should return Unsupported Media Type for invalid POST requests`() {
+    fun `server should return Bad Request for invalid POST requests with correct content type`() {
+        testApplication {
+            val response = client.post("/graphql") {
+                contentType(ContentType.Application.Json)
+            }
+            assertEquals(HttpStatusCode.BadRequest, response.status)
+        }
+    }
+
+    @Test
+    fun `server should return Unsupported Media Type for POST requests with invalid content type`() {
         testApplication {
             val response = client.post("/graphql")
             assertEquals(HttpStatusCode.UnsupportedMediaType, response.status)
@@ -234,12 +244,7 @@ class GraphQLPluginTest {
 
 fun Application.testGraphQLModule() {
     install(StatusPages) {
-        exception<Throwable> { call, cause ->
-            when (cause) {
-                is UnsupportedOperationException -> call.respond(HttpStatusCode.MethodNotAllowed)
-                else -> call.respond(HttpStatusCode.BadRequest)
-            }
-        }
+        defaultGraphQLStatusPages()
     }
     install(GraphQL) {
         schema {

website/docs/server/ktor-server/ktor-overview.mdx

@@ -99,6 +99,13 @@ GraphQL plugin provides following `Route` extension functions
 - `Route#graphQLSDLRoute` - GraphQL route for exposing schema in Schema Definition Language (SDL) format
 - `Route#graphiQLRoute` - GraphQL route for exposing [an official IDE](https://github.com/graphql/graphiql) from the GraphQL Foundation
 
+## StatusPages
+
+`graphql-kotlin-ktor-server` plugin differs from Spring as it relies on Ktor's StatusPages plugin to perform error handling.
+It is recommended to use the default settings, however, if you would like to customize your error handling you can create
+your own handler. One example might be if you need to catch a custom Authorization error to return a 401 status code.
+Please see [Ktor's Official Documentation for StatusPages](https://ktor.io/docs/server-status-pages.html)
+
 ## GraalVm Native Image Support
 
 GraphQL Kotlin Ktor Server can be compiled to a [native image](https://www.graalvm.org/latest/reference-manual/native-image/)