Unable to use go-langserver

[robertgzr]

Describe the bug
Configuring to use go-langserver leads to errors at startup

To Reproduce
coc-settings.json:

{

  "coc.source.gocode.enable": false,

  "languageserver": {
    
    "go-langserver": {
      "command": "go-langserver",
      "args": ["-gocodecompletion", "-func-snippet-enabled"],
      "filetypes": ["go"],
      "enable": true
    },
 
  }
}

Additional context
go-langserver logs

langserver-go: reading on stdin, writing on stdout
Passing an initialize rootPath URI ("file:///home/robertgzr/code-1/src") is deprecated. Use rootUri instead.
jsonrpc2 handler: notification "workspace/didChangeConfiguration" handling error: jsonrpc2: code -32601 message: method not supported: workspace/didChangeConfiguration
[3  - 16:59:49] Request textDocument/completion failed.
  Message: invalid position: /home/robertgzr/code-1/src/main.go:1:1 (file only has 2 lines)
  Code: 0 

[chemzqm]

I can fix the notification problem but I still get

2018-09-09T03:58:37.610 ERROR (pid:6249) [server] - uncaughtException Error: Header must provide a Content-Length property.
    at StreamMessageReader.onData (/Users/chemzqm/vim-dev/coc.nvim/node_modules/vscode-jsonrpc/lib/messageReader.js:200:27)
    at Socket.<anonymous> (/Users/chemzqm/vim-dev/coc.nvim/node_modules/vscode-jsonrpc/lib/messageReader.js:185:19)
    at Socket.emit (events.js:182:13)
    at addChunk (_stream_readable.js:283:12)
    at readableAddChunk (_stream_readable.js:264:11)
    at Socket.Readable.push (_stream_readable.js:219:10)

Have no idea with it.

[chemzqm]

Should be bug of sourcegraph/go-langserver#313

Try build from the source to see if error still exists, it would be better to configure go-langserver like this

    "go": {
      "command": "go-langserver",
      "args": [],
      "initializationOptions": {
        "funcSnippetEnabled": true,
        "gocodeCompletionEnabled": true
      },
      "filetypes": ["go"]
    },

[fannheyward]

sourcegraph/go-langserver@d0a69e9 has fixed this error.

[chemzqm]

When I use gocode 1.11 the gocode of go-langserver get panic, see sourcegraph/go-langserver#316

It's not panic with gocode 1.10 but I still can't get any correct completion in every situation. I think that go-langserver suck at it.

The solution is not to use completion of go-langserver or help them to fix the problem.

[chemzqm]

It works as expected on my mac now, try update go-langserver.