[v3] alpha.85 version wails init newly created program cannot run normally

[vvair]

Description

v3 alpha.79 -- alpha.85 version wails init newly created program cannot run normally
v3 alpha.78 normal display

To Reproduce

Use windows11 or macos to run the following code, the window will show network error or blank

go install github.com/wailsapp/wails/v3/cmd/wails3@v3.0.0-alpha.79
or
go install github.com/wailsapp/wails/v3/cmd/wails3@v3.0.0-alpha.85

wails3 init -n myapp -t vanilla
cd myapp && wails3 dev

Expected behaviour

Window normal display

Screenshots

Attempted Fixes

No response

System Details

┌───────────────────────────────────────────────────────────────────────────────────┐
| Xcode cli tools | 2416                                                            |
| npm             | 10.9.7                                                          |
| *NSIS           | Not Installed. Install with `brew install makensis`.            |
| docker          | *Docker version 29.4.0, build 9d7ad9f (cross-compilation ready) |
|                                                                                   |
└───────────────────────────── * - Optional Dependency ─────────────────────────────┘

# Checking for issues 

 SUCCESS  No issues found

# Diagnosis 

 SUCCESS  Your system is ready for Wails development!

Need documentation? Run: wails3 docs
 ♥   If Wails is useful to you or your company, please consider sponsoring the project: wails3 sponsor

du  …/cmd/wails3/myapp    v1.26.2  ♥ 22:12  clear                 


du  …/cmd/wails3/myapp    v1.26.2  ♥ 22:13  wails3 doctor
 Wails (v3.0.0-alpha.85)  Wails Doctor 
                                                                                                                              
# System 

┌──────────────────────────────────────────────────┐
| Name          | MacOS                            |
| Version       | 26.4.1                           |
| ID            | 25E253                           |
| Branding      | MacOS 26.4.1                     |
| Platform      | darwin                           |
| Architecture  | arm64                            |
| Apple Silicon | true                             |
| CPU           | Apple M4                         |
| CPU 1         | Apple M4                         |
| CPU 2         | Apple M4                         |
| GPU           | 10 cores, Metal Support: Metal 4 |
| Memory        | 32 GB                            |
└──────────────────────────────────────────────────┘

# Build Environment 

┌──────────────────────────────────────────────────────────────────────┐
| Wails CLI      | v3.0.0-alpha.85                                     |
| Go Version     | go1.26.2                                            |
| -buildmode     | exe                                                 |
| -compiler      | gc                                                  |
| CGO_CFLAGS     |                                                     |
| CGO_CPPFLAGS   |                                                     |
| CGO_CXXFLAGS   |                                                     |
| CGO_ENABLED    | 1                                                   |
| CGO_LDFLAGS    |                                                     |
| DefaultGODEBUG | cryptocustomrand=1,tlssecpmlkem=0,urlstrictcolons=0 |
| GOARCH         | arm64                                               |
| GOARM64        | v8.0                                                |
| GOOS           | darwin                                              |
└──────────────────────────────────────────────────────────────────────┘

# Dependencies 

┌───────────────────────────────────────────────────────────────────────────────────┐
| Xcode cli tools | 2416                                                            |
| npm             | 10.9.7                                                          |
| *NSIS           | Not Installed. Install with `brew install makensis`.            |
| docker          | *Docker version 29.4.0, build 9d7ad9f (cross-compilation ready) |
|                                                                                   |
└───────────────────────────── * - Optional Dependency ─────────────────────────────┘

# Checking for issues 

 SUCCESS  No issues found

# Diagnosis 

 SUCCESS  Your system is ready for Wails development!

Additional context

No response

[secondarykey]

I think this might be the same issue. I investigated it on Windows and posted findings here (different OS, but the same alpha.79 regression):

#5059 (comment)

The short version: PR #5265 (introduced in alpha.79) forces tcp4 when connecting to the Vite dev server, which breaks on systems where localhost resolves to ::1 (IPv6). Adding --host 127.0.0.1 to the Vite startup command worked as a workaround for me.

[phoenixsheppard28]

I think this might be the same issue. I investigated it on Windows and posted findings here (different OS, but the same alpha.79 regression):

#5059 (comment)

The short version: PR #5265 (introduced in alpha.79) forces tcp4 when connecting to the Vite dev server, which breaks on systems where localhost resolves to ::1 (IPv6). Adding --host 127.0.0.1 to the Vite startup command worked as a workaround for me.

worked for me as well on MacOS
added

server: {
    host: "127.0.0.1",
  },

to vite.config.ts in the defineConfig constructor