ft: add functions-loopback flag for Docker

package.json

@@ -208,6 +208,7 @@
     "eslint-plugin-n": "^17.16.1",
     "form-data": "4.0.2",
     "is-ci": "4.1.0",
+    "markdown-magic": "^2.6.1",
     "nock": "14.0.1",
     "npm-run-all2": "^7.0.2",
     "p-timeout": "6.1.4",

src/commands/dev/dev.ts

@@ -323,6 +323,11 @@ export const createDevCommand = (program: BaseCommand) => {
         .conflicts('edgeInspect')
         .argParser(validateShortFlagArgs),
     )
+    .addOption(
+      new Option('--functions-loopback <host>', 'host for loopback requests to functions server')
+        .default('127.0.0.1')
+        .choices(['::1', '127.0.0.1']),
+    )
     .addExamples([
       'netlify dev',
       'netlify dev -d public',

src/commands/functions/functions.ts

@@ -1,4 +1,4 @@
-import type { OptionValues } from 'commander'
+import { Option, OptionValues } from 'commander'
 
 import { chalk } from '../../utils/command-helpers.js'
 import requiresSiteInfo from '../../utils/hooks/requires-site-info.js'
@@ -61,6 +61,11 @@ export const createFunctionsCommand = (program: BaseCommand) => {
     )
     .option('--port <port>', 'Port where netlify dev is accessible. e.g. 8888', (value) => Number.parseInt(value))
     .option('-o, --offline', 'Disables any features that require network access')
+    .addOption(
+      new Option('--functions-loopback <host>', 'host for loopback requests to functions server')
+        .default('127.0.0.1')
+        .choices(['::1', '127.0.0.1']),
+    )
     .addExamples([
       'netlify functions:invoke',
       'netlify functions:invoke myfunction',
@@ -100,6 +105,11 @@ NOT the same as listing the functions that have been deployed. For that info you
     .option('-f, --functions <dir>', 'Specify a functions directory to serve')
     .option('-p, --port <port>', 'Specify a port for the functions server', (value) => Number.parseInt(value))
     .option('-o, --offline', 'Disables any features that require network access')
+    .addOption(
+      new Option('--functions-loopback <host>', 'host for loopback requests to functions server')
+        .default('127.0.0.1')
+        .choices(['::1', '127.0.0.1']),
+    )
     .addHelpText('after', 'Helpful for debugging functions.')
     .action(async (options: OptionValues, command: BaseCommand) => {
       const { functionsServe } = await import('./functions-serve.js')

src/commands/serve/index.ts

@@ -45,6 +45,11 @@ export const createServeCommand = (program: BaseCommand) =>
         .argParser((value) => Number.parseInt(value))
         .hideHelp(),
     )
+    .addOption(
+      new Option('--functions-loopback <host>', 'host for loopback requests to functions server')
+        .default('127.0.0.1')
+        .choices(['::1', '127.0.0.1']),
+    )
     .addExamples(['netlify serve', 'BROWSER=none netlify serve # disable browser auto opening'])
     .action(async (options: Option, command: BaseCommand) => {
       const { serve } = await import('./serve.js')

src/lib/functions/runtimes/js/index.ts

@@ -84,7 +84,7 @@ export const invokeFunction = async ({ context, environment, event, func, timeou
         const client = createConnection(
           {
             port: result.streamPort,
-            host: 'localhost',
+            host: func.settings.functionsLoopback,
           },
           () => {
             result.body = client

src/utils/detect-server-settings.ts

@@ -306,6 +306,7 @@ const detectServerSettings = async (
 
   return {
     ...settings,
+    functionsLoopback: flags.functionsLoopback,
     port: acquiredPort,
     jwtSecret: devConfig.jwtSecret || 'secret',
     jwtRolePath: devConfig.jwtRolePath || 'app_metadata.authorization.roles',

src/utils/types.ts

@@ -50,6 +50,7 @@ export type ServerSettings = BaseServerSettings & {
   jwtRolePath: string
   /** The port where the dev server is running on */
   port: number
+  functionsLoopback: '::1' | '127.0.0.1'
   /** The port where the functions are running on */
   functionsPort: number
   https?: { key: string; cert: string; keyFilePath: string; certFilePath: string }