Remote procedure call via bash

[beppo-ivel]

Would like to test some jsonrpc on pylsp. There for I want to use bash. I opened terminal and execute the send function. But pylsp throws an error. Why pylsp has problem to parse JSON message?

$ send() { msg=$(jq -n "$@"); printf "%s\r\n" "Content-Length: ${#msg}" "" "$msg"; }

$ send '{"jsonrpc": "2.0", "id": 1, "method": "initialize", "params": {"processId": null, "rootPath": null, "rootUri": "file:///home/user", "capabilities": {}, "workspaceFolders": null}}' | pylsp

But it throws errors I couldn't resolved:

Content-Length: 777
Content-Type: application/vscode-jsonrpc; charset=utf8
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": {
        "capabilities": {
            "codeActionProvider": true,
            "codeLensProvider": {
                "resolveProvider": false
            },
            "completionProvider": {
                "resolveProvider": true,
                "triggerCharacters": [
                    "."
                ]
            },
            "documentFormattingProvider": true,
            "documentHighlightProvider": true,
            "documentRangeFormattingProvider": true,
            "documentSymbolProvider": true,
            "definitionProvider": true,
            "executeCommandProvider": {
                "commands": []
            },
            "hoverProvider": true,
            "referencesProvider": true,
            "renameProvider": true,
            "foldingRangeProvider": true,
            "signatureHelpProvider": {
                "triggerCharacters": [
                    "(",
                    ",",
                    "="
                ]
            },
            "textDocumentSync": {
                "change": 2,
                "save": {
                    "includeText": true
                },
                "openClose": true
            },
            "workspace": {
                "workspaceFolders": {
                    "supported": true,
                    "changeNotifications": true
                }
            },
            "experimental": {}
        },
        "serverInfo": {
            "name": "pylsp",
            "version": "1.7.2"
        }
    }
}
2023-04-13 17:35:01,848 CEST - ERROR - pylsp_jsonrpc.streams - Failed to parse JSON message b''
Traceback (most recent call last):
  File "/home/user/.local/lib/python3.9/site-packages/pylsp_jsonrpc/streams.py", line 40, in listen
    message_consumer(json.loads(request_str.decode('utf-8')))
ujson.JSONDecodeError: Expected object or value