Fix base URL

build.sbt

@@ -45,7 +45,10 @@ lazy val frontend = (project in file("modules/frontend"))
       "org.http4s" %%% "http4s-client" % "0.23.16"
     ),
     baseUri := {
-      if (insideCI.value) "" else "http://localhost:9000"
+      if (insideCI.value) ""
+      else
+        // Vite will proxy this to the backend. See vite.config.js
+        "/api"
     },
     buildInfoKeys := Seq[BuildInfoKey](baseUri),
     buildInfoPackage := "smithy4s_codegen",

modules/backend/src/main/scala/smithy4s_codegen/Main.scala

@@ -46,7 +46,6 @@ class SmithyCodeGenerationServiceImpl(generator: Smithy4s, validator: Validate)
 }
 
 object Routes {
-  import org.http4s.server.middleware.CORS
   def exampleRoute(localJars: List[File]): Resource[IO, HttpRoutes[IO]] =
     Resource
       .eval(ModelLoader(localJars))
@@ -55,7 +54,6 @@ object Routes {
         SimpleRestJsonBuilder
           .routes(new SmithyCodeGenerationServiceImpl(generator, validator))
           .resource
-          .map(CORS(_))
       }
 
   private val docs: HttpRoutes[IO] =

modules/frontend/src/main/scala/smithy4s_codegen/ApiBuilder.scala

@@ -11,6 +11,8 @@ import org.http4s.Uri
 import smithy4s_codegen.BuildInfo.baseUri
 import smithy4s.kinds.PolyFunction
 import cats.effect.std.Dispatcher
+import org.http4s.client.Client
+import util.chaining._
 
 object ApiBuilder {
   def build: Resource[IO, SmithyCodeGenerationService[EventStream]] =
@@ -19,7 +21,10 @@ object ApiBuilder {
         ec <- IO.executionContext.toResource
         client <-
           SimpleRestJsonBuilder(SmithyCodeGenerationService)
-            .client(FetchClientBuilder[IO].create)
+            .client(
+              FetchClientBuilder[IO].create
+                .pipe(resetBaseUri)
+            )
             .uri(Uri.unsafeFromString(baseUri))
             .resource
       } yield {
@@ -30,4 +35,10 @@ object ApiBuilder {
       }
 
     }
+
+  private def resetBaseUri(c: Client[IO]): Client[IO] = Client[IO] { req =>
+    val amendedUri = req.uri.copy(scheme = None, authority = None)
+    val amendedRequest = req.withUri(amendedUri)
+    c.run(amendedRequest)
+  }
 }

modules/frontend/src/main/scala/smithy4s_codegen/Main.scala

@@ -10,7 +10,6 @@ import org.http4s.client.Client
 import org.http4s.dom.FetchClientBuilder
 import org.scalajs.dom
 import smithy4s.http4s.SimpleRestJsonBuilder
-import smithy4s_codegen.BuildInfo.baseUri
 import smithy4s_codegen.api.SmithyCodeGenerationService
 import smithy4s_codegen.components.pages.Home
 

modules/frontend/src/main/scala/smithy4s_codegen/components/pages/Home.scala

@@ -2,7 +2,6 @@ package smithy4s_codegen.components.pages
 
 import com.raquo.laminar.api.L._
 import org.scalajs.dom.ext.Ajax.InputData
-import smithy4s_codegen.BuildInfo.baseUri
 import smithy4s_codegen.api.Smithy4sConvertInput
 import smithy4s_codegen.api.Smithy4sConvertOutput
 import smithy4s_codegen.api.SmithyCodeGenerationService
@@ -29,7 +28,7 @@ object Home {
             .recover {
               case InvalidSmithyContent(errors) =>
                 Some(CodeEditor.ValidationResult.Failed(errors))
-              case ex: Throwable =>
+              case ex =>
                 Some(CodeEditor.ValidationResult.UnknownFailure(ex))
             }
         }
@@ -45,7 +44,7 @@ object Home {
               .map(r =>
                 CodeEditor.Smithy4sConversionResult.Success(r.generated)
               )
-              .recover { case ex: Throwable =>
+              .recover { ex =>
                 Some(CodeEditor.Smithy4sConversionResult.UnknownFailure(ex))
               }
           }

modules/frontend/vite.config.js

@@ -8,4 +8,13 @@ export default defineConfig({
       projectID: "frontend",
     }),
   ],
+  server: {
+    proxy: {
+      // For requests to /api/**, drop the prefix and proxy the rest to the backend.
+      "/api": {
+        target: "http://localhost:9000",
+        rewrite: (path) => path.replace(/^\/api/, ""),
+      },
+    },
+  },
 });