fix(emulator): Hosting emulator should not connect to 0.0.0.0 for emulators (firebase#3141)

* fix(emulator): Hosting emulator should not connect to 0.0.0.0 for emulators (firebase#3121)

* Update CHANGELOG.md

Co-authored-by: Yuchen Shi <[email protected]>

Author: 2 people

CHANGELOG.md

@@ -1,3 +1,4 @@
 - Fixes issue where proxied requests to dynamic content through the Hosting emulator would return unexpected `location` headers. (#3097)
 - Fixes issue where optional extension parameters could not be omitted. (#3126)
 - Fixes issue where deploying Cloud Functions for Firebase fails on Node.js v15. (#3120)
+- Fixes issue where hosting emulator would connect to 0.0.0.0 for emulators. (#3121)

src/hosting/implicitInit.ts

@@ -68,8 +68,17 @@ export async function implicitInit(options: any): Promise<TemplateServerResponse
     const info = EmulatorRegistry.getInfo(e);
 
     if (info) {
-      // IPv6 hosts need to be quoted using brackets.
-      const host = info.host.includes(":") ? `[${info.host}]` : info.host;
+      let host = info.host;
+
+      if (host === "0.0.0.0") {
+        host = "127.0.0.1";
+      } else if (host === "::") {
+        host = "[::1]";
+      } else if (host.includes(":")) {
+        // IPv6 hosts need to be quoted using brackets.
+        host = `[${host}]`;
+      }
+
       emulators[e] = {
         host,
         port: info.port,