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我试图创建一个API来发送由套接字获取的信息。
要从我的套接字获取信息，我正在使用zmq。
这个想法是当从套接字获得信息时，将这些信息作为响应发送到我的API中。下面的代码假装这样做。zmq和express出错
[...]
enclaveSocket.on('message', function (message) {
res_json.info = message.toString('base64');
res.json(res_json);
});
enclaveSocket.send('chesf:public');
[...]
在第一次请求我的快递API，回报预期：
{
"organization": "my_org",
"info": "AjCWyQeBNeuMnA3nAUrbprxctrdOgZmjDR5Rmuw6LzzMpALspfNapLMoRGPx9YEGFrqrE5vdHKPb/z0S23i8v"
}
但在第二请求，我有以下错误API崩溃：
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)
这它。