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我試圖創建一個API來發送由套接字獲取的信息。
要從我的套接字獲取信息，我正在使用zmq。
這個想法是當從套接字獲得信息時，將這些信息作爲響應發送到我的API中。下面的代碼假裝這樣做。zmq和express出錯
[...]
enclaveSocket.on('message', function (message) {
res_json.info = message.toString('base64');
res.json(res_json);
});
enclaveSocket.send('chesf:public');
[...]
在第一次請求我的快遞API，回報預期：
{
"organization": "my_org",
"info": "AjCWyQeBNeuMnA3nAUrbprxctrdOgZmjDR5Rmuw6LzzMpALspfNapLMoRGPx9YEGFrqrE5vdHKPb/z0S23i8v"
}
但在第二請求，我有以下錯誤API崩潰：
events.js:160
throw er; // Unhandled 'error' event
^
Error: Can't set headers after they are sent.
at ServerResponse.setHeader (_http_outgoing.js:367:11)
at ServerResponse.header (/home/matteus/keyvault-node/node_modules/express/lib/response.js:725:10)
at ServerResponse.send (/home/matteus/keyvault-node/node_modules/express/lib/response.js:170:12)
at ServerResponse.json (/home/matteus/keyvault-node/node_modules/express/lib/response.js:256:15)
at exports.Socket.<anonymous> (/home/matteus/keyvault-node/routes/keys.js:58:21)
at emitOne (events.js:101:20)
at exports.Socket.emit (events.js:188:7)
at exports.Socket.Socket._flushRead (/home/matteus/keyvault-node/node_modules/zmq/lib/index.js:636:10)
at exports.Socket.Socket._flushReads (/home/matteus/keyvault-node/node_modules/zmq/lib/index.js:676:23)
at Object._zmq.onReadReady (/home/matteus/keyvault-node/node_modules/zmq/lib/index.js:297:10)
這它。