diff --git a/packages/remix-dev/cli/commands.ts b/packages/remix-dev/cli/commands.ts
index 54a274f2ded..0280942ad37 100644
--- a/packages/remix-dev/cli/commands.ts
+++ b/packages/remix-dev/cli/commands.ts
@@ -174,8 +174,8 @@ export async function build(
     sourcemap,
   };
   if (mode === "development" && config.future.v2_dev) {
-    let origin = await resolveDevOrigin(config);
-    options.devOrigin = origin;
+    let resolved = await resolveDev(config);
+    options.REMIX_DEV_ORIGIN = resolved.REMIX_DEV_ORIGIN;
   }
 
   let fileWatchCache = createFileWatchCache();
@@ -238,7 +238,8 @@ export async function dev(
     return await new Promise(() => {});
   }
 
-  await devServer_unstable.serve(config, await resolveDevServe(config, flags));
+  let resolved = await resolveDevServe(config, flags);
+  await devServer_unstable.serve(config, resolved);
 }
 
 export async function codemod(
@@ -467,58 +468,72 @@ let parseMode = (
 
 let findPort = async () => getPort({ port: makeRange(3001, 3100) });
 
-type DevOrigin = {
-  scheme: string;
-  host: string;
-  port: number;
-};
-let resolveDevOrigin = async (
+let resolveDev = async (
   config: RemixConfig,
-  flags: Partial<DevOrigin> & {
+  flags: {
+    port?: number;
     tlsKey?: string;
     tlsCert?: string;
+    /** @deprecated */
+    scheme?: string; // TODO: remove in v2
+    /** @deprecated */
+    host?: string; // TODO: remove in v2
   } = {}
-): Promise<DevOrigin> => {
+) => {
   let dev = config.future.v2_dev;
   if (dev === false) throw Error("This should never happen");
 
-  // prettier-ignore
-  let scheme =
-    flags.scheme ??
-    (dev === true ? undefined : dev.scheme) ??
-    (flags.tlsKey && flags.tlsCert) ? "https": "http";
-  // prettier-ignore
-  let host =
-    flags.host ??
-    (dev === true ? undefined : dev.host) ??
-    "localhost";
   // prettier-ignore
   let port =
     flags.port ??
     (dev === true ? undefined : dev.port) ??
     (await findPort());
 
+  let tlsKey = flags.tlsKey ?? (dev === true ? undefined : dev.tlsKey);
+  if (tlsKey) tlsKey = path.resolve(tlsKey);
+  let tlsCert = flags.tlsCert ?? (dev === true ? undefined : dev.tlsCert);
+  if (tlsCert) tlsCert = path.resolve(tlsCert);
+  let isTLS = tlsKey && tlsCert;
+
+  let REMIX_DEV_ORIGIN = process.env.REMIX_DEV_ORIGIN;
+  if (REMIX_DEV_ORIGIN === undefined) {
+    // prettier-ignore
+    let scheme =
+      flags.scheme ?? // TODO: remove in v2
+      (dev === true ? undefined : dev.scheme) ?? // TODO: remove in v2
+      isTLS ? "https" : "http";
+    // prettier-ignore
+    let hostname =
+      flags.host ?? // TODO: remove in v2
+      (dev === true ? undefined : dev.host) ?? // TODO: remove in v2
+      "localhost";
+    REMIX_DEV_ORIGIN = `${scheme}://${hostname}:${port}`;
+  }
+
   return {
-    scheme,
-    host,
     port,
+    tlsKey,
+    tlsCert,
+    REMIX_DEV_ORIGIN: new URL(REMIX_DEV_ORIGIN),
   };
 };
 
-type DevServeFlags = DevOrigin & {
-  command?: string;
-  restart: boolean;
-  tlsKey?: string;
-  tlsCert?: string;
-};
 let resolveDevServe = async (
   config: RemixConfig,
-  flags: Partial<DevServeFlags> = {}
-): Promise<DevServeFlags> => {
+  flags: {
+    port?: number;
+    tlsKey?: string;
+    tlsCert?: string;
+    scheme?: string; // TODO: remove in v2
+    host?: string; // TODO: remove in v2
+    command?: string;
+    restart?: boolean;
+  } = {}
+) => {
   let dev = config.future.v2_dev;
   if (dev === false) throw Error("Cannot resolve dev options");
 
-  let origin = await resolveDevOrigin(config, flags);
+  let resolved = await resolveDev(config, flags);
 
   // prettier-ignore
   let command =
@@ -528,16 +543,9 @@ let resolveDevServe = async (
   let restart =
     flags.restart ?? (dev === true ? undefined : dev.restart) ?? true;
 
-  let tlsKey = flags.tlsKey ?? (dev === true ? undefined : dev.tlsKey);
-  if (tlsKey) tlsKey = path.resolve(tlsKey);
-  let tlsCert = flags.tlsCert ?? (dev === true ? undefined : dev.tlsCert);
-  if (tlsCert) tlsCert = path.resolve(tlsCert);
-
   return {
+    ...resolved,
     command,
-    ...origin,
     restart,
-    tlsKey,
-    tlsCert,
   };
 };
diff --git a/packages/remix-dev/cli/run.ts b/packages/remix-dev/cli/run.ts
index df1cdcaa4ef..c5fa46eec15 100644
--- a/packages/remix-dev/cli/run.ts
+++ b/packages/remix-dev/cli/run.ts
@@ -44,8 +44,6 @@ ${colors.logoBlue("R")} ${colors.logoGreen("E")} ${colors.logoYellow(
 
     [v2_dev]
     --command, -c       Command used to run your app server
-    --scheme            Scheme for the dev server. Default: http
-    --host              Host for the dev server. Default: localhost
     --port              Port for the dev server. Default: any open port
     --no-restart        Do not restart the app server when rebuilds occur.
     --tls-key           Path to TLS key (key.pem)
@@ -183,13 +181,15 @@ export async function run(argv: string[] = process.argv.slice(2)) {
       // dev server
       "--command": String,
       "-c": "--command",
-      "--scheme": String,
-      "--host": String,
       "--port": Number,
       "-p": "--port",
       "--no-restart": Boolean,
       "--tls-key": String,
       "--tls-cert": String,
+
+      // deprecated, remove in v2
+      "--scheme": String,
+      "--host": String,
     },
     {
       argv,
diff --git a/packages/remix-dev/compiler/js/compiler.ts b/packages/remix-dev/compiler/js/compiler.ts
index 7679e636873..42b5cf3f4cb 100644
--- a/packages/remix-dev/compiler/js/compiler.ts
+++ b/packages/remix-dev/compiler/js/compiler.ts
@@ -136,6 +136,10 @@ const createEsbuildConfig = (
     publicPath: ctx.config.publicPath,
     define: {
       "process.env.NODE_ENV": JSON.stringify(ctx.options.mode),
+      "process.env.REMIX_DEV_ORIGIN": JSON.stringify(
+        ctx.options.REMIX_DEV_ORIGIN ?? ""
+      ),
+      // TODO: remove in v2
       "process.env.REMIX_DEV_SERVER_WS_PORT": JSON.stringify(
         ctx.config.devServerPort
       ),
diff --git a/packages/remix-dev/compiler/options.ts b/packages/remix-dev/compiler/options.ts
index 072f16ce1e6..2f85f6160e9 100644
--- a/packages/remix-dev/compiler/options.ts
+++ b/packages/remix-dev/compiler/options.ts
@@ -4,10 +4,5 @@ export type Options = {
   mode: Mode;
   sourcemap: boolean;
 
-  // TODO: required in v2
-  devOrigin?: {
-    scheme: string;
-    host: string;
-    port: number;
-  };
+  REMIX_DEV_ORIGIN?: URL; // TODO: required in v2
 };
diff --git a/packages/remix-dev/compiler/server/compiler.ts b/packages/remix-dev/compiler/server/compiler.ts
index f1fb0c0d491..cd37e98f1ee 100644
--- a/packages/remix-dev/compiler/server/compiler.ts
+++ b/packages/remix-dev/compiler/server/compiler.ts
@@ -104,12 +104,16 @@ const createEsbuildConfig = (
     publicPath: ctx.config.publicPath,
     define: {
       "process.env.NODE_ENV": JSON.stringify(ctx.options.mode),
-      // TODO: remove REMIX_DEV_SERVER_WS_PORT in v2
+      // TODO: remove in v2
       "process.env.REMIX_DEV_SERVER_WS_PORT": JSON.stringify(
         ctx.config.devServerPort
       ),
+      "process.env.REMIX_DEV_ORIGIN": JSON.stringify(
+        ctx.options.REMIX_DEV_ORIGIN ?? ""
+      ),
+      // TODO: remove in v2
       "process.env.REMIX_DEV_HTTP_ORIGIN": JSON.stringify(
-        ctx.options.devOrigin ?? "" // TODO: remove nullish check in v2
+        ctx.options.REMIX_DEV_ORIGIN ?? ""
       ),
     },
     jsx: "automatic",
diff --git a/packages/remix-dev/compiler/server/plugins/entry.ts b/packages/remix-dev/compiler/server/plugins/entry.ts
index 4966dd3ad93..edb4fb60b08 100644
--- a/packages/remix-dev/compiler/server/plugins/entry.ts
+++ b/packages/remix-dev/compiler/server/plugins/entry.ts
@@ -50,13 +50,6 @@ ${Object.keys(config.routes)
   export const future = ${JSON.stringify(config.future)};
   export const publicPath = ${JSON.stringify(config.publicPath)};
   export const entry = { module: entryServer };
-  ${
-    options.devOrigin
-      ? `export const dev = ${JSON.stringify({
-          port: options.devOrigin.port,
-        })}`
-      : ""
-  }
   export const routes = {
     ${Object.keys(config.routes)
       .map((key, index) => {
diff --git a/packages/remix-dev/config.ts b/packages/remix-dev/config.ts
index 73abaaa16f2..f6084a07501 100644
--- a/packages/remix-dev/config.ts
+++ b/packages/remix-dev/config.ts
@@ -38,12 +38,15 @@ export type ServerPlatform = "node" | "neutral";
 
 type Dev = {
   command?: string;
-  scheme?: string;
-  host?: string;
   port?: number;
   restart?: boolean;
   tlsKey?: string;
   tlsCert?: string;
+
+  /** @deprecated remove in v2 */
+  scheme?: string;
+  /** @deprecated remove in v2 */
+  host?: string;
 };
 
 interface FutureConfig {
diff --git a/packages/remix-dev/devServer_unstable/index.ts b/packages/remix-dev/devServer_unstable/index.ts
index 25cebb061d9..1abeb364142 100644
--- a/packages/remix-dev/devServer_unstable/index.ts
+++ b/packages/remix-dev/devServer_unstable/index.ts
@@ -24,14 +24,6 @@ import invariant from "../invariant";
 import { logger } from "../tux";
 import { kill, killtree } from "./proc";
 
-type Origin = {
-  scheme: string;
-  host: string;
-  port: number;
-};
-
-let stringifyOrigin = (o: Origin) => `${o.scheme}://${o.host}:${o.port}`;
-
 let detectBin = async (): Promise<string> => {
   let pkgManager = detectPackageManager() ?? "npm";
   if (pkgManager === "npm") {
@@ -47,12 +39,11 @@ export let serve = async (
   initialConfig: RemixConfig,
   options: {
     command?: string;
-    scheme: string;
-    host: string;
     port: number;
-    restart: boolean;
     tlsKey?: string;
     tlsCert?: string;
+    REMIX_DEV_ORIGIN: URL;
+    restart: boolean;
   }
 ) => {
   await loadEnv(initialConfig.rootDirectory);
@@ -92,12 +83,6 @@ export let serve = async (
       : http.createServer(app);
   let websocket = Socket.serve(server);
 
-  let origin: Origin = {
-    scheme: options.scheme,
-    host: options.host,
-    port: options.port,
-  };
-
   let bin = await detectBin();
   let startAppServer = (command?: string) => {
     let cmd =
@@ -113,7 +98,8 @@ export let serve = async (
           NODE_ENV: "development",
           PATH:
             bin + (process.platform === "win32" ? ";" : ":") + process.env.PATH,
-          REMIX_DEV_HTTP_ORIGIN: stringifyOrigin(origin),
+          REMIX_DEV_ORIGIN: options.REMIX_DEV_ORIGIN.href,
+          REMIX_DEV_HTTP_ORIGIN: options.REMIX_DEV_ORIGIN.href, // TODO: remove in v2
           FORCE_COLOR: process.env.NO_COLOR === undefined ? "1" : "0",
         },
         // https://github.com/sindresorhus/execa/issues/433
@@ -178,7 +164,7 @@ export let serve = async (
       options: {
         mode: "development",
         sourcemap: true,
-        devOrigin: origin,
+        REMIX_DEV_ORIGIN: options.REMIX_DEV_ORIGIN,
       },
       fileWatchCache,
       logger,
@@ -276,7 +262,7 @@ export let serve = async (
     }
   );
 
-  server.listen(origin.port);
+  server.listen(options.port);
 
   return new Promise(() => {}).finally(async () => {
     state.appServer?.pid && (await kill(state.appServer.pid));
diff --git a/packages/remix-react/components.tsx b/packages/remix-react/components.tsx
index c77492a548d..ba367468e3c 100644
--- a/packages/remix-react/components.tsx
+++ b/packages/remix-react/components.tsx
@@ -1782,7 +1782,6 @@ export const LiveReload =
   process.env.NODE_ENV !== "development"
     ? () => null
     : function LiveReload({
-        // TODO: remove REMIX_DEV_SERVER_WS_PORT in v2
         port,
         timeoutMs = 1000,
         nonce = undefined,
@@ -1799,13 +1798,25 @@ export const LiveReload =
             dangerouslySetInnerHTML={{
               __html: js`
                 function remixLiveReloadConnect(config) {
-                  let protocol = location.protocol === "https:" ? "wss:" : "ws:";
-                  let host = location.hostname;
-                  let port = ${port} || (window.__remixContext && window.__remixContext.dev && window.__remixContext.dev.port) || ${Number(
-                process.env.REMIX_DEV_SERVER_WS_PORT || 8002
-              )};
-                  let socketPath = protocol + "//" + host + ":" + port + "/socket";
-                  let ws = new WebSocket(socketPath);
+                  let REMIX_DEV_ORIGIN = ${JSON.stringify(
+                    process.env.REMIX_DEV_ORIGIN
+                  )};
+                  let protocol =
+                    REMIX_DEV_ORIGIN ? new URL(REMIX_DEV_ORIGIN).protocol.replace(/^http/, "ws") :
+                    location.protocol === "https:" ? "wss:" : "ws:"; // remove in v2?
+                  let hostname = location.hostname;
+                  let url = new URL(protocol + "//" + hostname + "/socket");
+
+                  url.port =
+                    ${port} ||
+                    REMIX_DEV_ORIGIN ? new URL(REMIX_DEV_ORIGIN).port :
+                    Number(${
+                      // TODO: remove in v2
+                      process.env.REMIX_DEV_SERVER_WS_PORT
+                    }) ||
+                    8002;
+
+                  let ws = new WebSocket(url.href);
                   ws.onmessage = async (message) => {
                     let event = JSON.parse(message.data);
                     if (event.type === "LOG") {
diff --git a/packages/remix-server-runtime/build.ts b/packages/remix-server-runtime/build.ts
index 7a5cbc5c606..00c5e82980a 100644
--- a/packages/remix-server-runtime/build.ts
+++ b/packages/remix-server-runtime/build.ts
@@ -15,7 +15,6 @@ export interface ServerBuild {
   publicPath: string;
   assetsBuildDirectory: string;
   future: FutureConfig;
-  dev?: { port: number };
 }
 
 export interface HandleDocumentRequestFunction {
diff --git a/packages/remix-server-runtime/dev.ts b/packages/remix-server-runtime/dev.ts
index 2163e36b4d3..fe8287eb6bc 100644
--- a/packages/remix-server-runtime/dev.ts
+++ b/packages/remix-server-runtime/dev.ts
@@ -1,16 +1,25 @@
 import type { ServerBuild } from "./build";
 
-export function broadcastDevReady(build: ServerBuild, origin?: string) {
+export async function broadcastDevReady(build: ServerBuild, origin?: string) {
   origin ??= process.env.REMIX_DEV_HTTP_ORIGIN;
   if (!origin) throw Error("Dev server origin not set");
+  let url = new URL(origin);
+  url.pathname = "ping";
 
-  fetch(`${origin}/ping`, {
+  let response = await fetch(url, {
     method: "POST",
     headers: { "Content-Type": "application/json" },
     body: JSON.stringify({ buildHash: build.assets.version }),
   }).catch((error) => {
-    console.error(`Could not reach Remix dev server at ${origin}`);
+    console.error(`Could not reach Remix dev server at ${url}`);
+    throw error;
   });
+  if (!response.ok) {
+    console.error(
+      `Could not reach Remix dev server at ${url} (${response.status})`
+    );
+    throw Error(await response.text());
+  }
 }
 
 export function logDevReady(build: ServerBuild) {
diff --git a/packages/remix-server-runtime/serverHandoff.ts b/packages/remix-server-runtime/serverHandoff.ts
index 07bdee23107..583f2a21db1 100644
--- a/packages/remix-server-runtime/serverHandoff.ts
+++ b/packages/remix-server-runtime/serverHandoff.ts
@@ -21,7 +21,6 @@ export function createServerHandoffString<T>(serverHandoff: {
   state: ValidateShape<T, HydrationState>;
   url: string;
   future: FutureConfig;
-  dev?: { port: number };
 }): string {
   // Uses faster alternative of jsesc to escape data returned from the loaders.
   // This string is inserted directly into the HTML in the `<Scripts>` element.