in test-sourcekit-lsp/test-sourcekit-lsp.py [0:0]
def request(self, method, params):
body = json.dumps({
'jsonrpc': '2.0',
'id': self.request_id,
'method': method,
'params': params
})
self.request_id += 1
self.script += 'Content-Length: {}\r\n\r\n{}'.format(len(body), body)