Node.js接收POST请求并使用以下命令进行响应
router.post('/latest', function(req, res, next) {
res.status(202).send(req.body);
console.log(res);
});
观察console.log(res);的输出，服务器似乎制定了一个202...响应，但是_bytesDispatched等于28，对应于HTTP/1.1 400 Bad Request（实际响应I站在另一边）。为什么会这样？
console.log(res);的输出：
ServerResponse {
_events: { finish: [Function: bound resOnFinish] },
_eventsCount: 1,
_maxListeners: undefined,
output:
[ 'HTTP/1.1 202 Accepted\r\nX-Powered-By: Express\r\nContent-Type: application/json; charset=utf-8\r\nContent-Length: 7\r\nETag: W/"7-7mCT8n6gALm4N/SpGscZkTFIPTE"\r\nDate: Thu, 04 Jul 2019 14:59:08 GMT\r\nConnection: keep-alive\r\n\r\n',
<Buffer 7b 22 62 22 3a 31 7d>,
'' ],
outputEncodings: [ 'latin1', undefined, 'latin1' ],
outputCallbacks: [ null, null, [Function: bound onFinish] ],
outputSize: 223,
writable: true,
_last: false,
upgrading: false,
chunkedEncoding: false,
shouldKeepAlive: true,
useChunkedEncodingByDefault: true,
sendDate: true,
_removedConnection: false,
_removedContLen: false,
_removedTE: false,
_contentLength: 7,
_hasBody: true,
_trailer: '',
finished: true,
_headerSent: true,
socket:
Socket {
connecting: false,
_hadError: false,
_handle:
TCP {
reading: true,
owner: [Circular],
onread: [Function: onread],
onconnection: null,
_consumed: true },
_parent: null,
_host: null,
_readableState:
ReadableState {
objectMode: false,
highWaterMark: 16384,
buffer: [BufferList],
length: 0,
pipes: null,
pipesCount: 0,
flowing: true,
ended: false,
endEmitted: false,
reading: true,
sync: false,
needReadable: true,
emittedReadable: false,
readableListening: false,
resumeScheduled: false,
destroyed: false,
defaultEncoding: 'utf8',
awaitDrain: 0,
readingMore: false,
decoder: null,
encoding: null },
readable: true,
_events:
{ finish: [Function: onSocketFinish],
end: [Array],
drain: [Array],
timeout: [Function: socketOnTimeout],
data: [Function: bound socketOnData],
close: [Array],
resume: [Function: onSocketResume],
pause: [Function: onSocketPause],
error: [Function] },
_eventsCount: 9,
_maxListeners: undefined,
_writableState:
WritableState {
objectMode: false,
highWaterMark: 16384,
finalCalled: false,
needDrain: false,
ending: true,
ended: true,
finished: false,
destroyed: false,
decodeStrings: false,
defaultEncoding: 'utf8',
length: 0,
writing: false,
corked: 0,
sync: false,
bufferProcessing: false,
onwrite: [Function: bound onwrite],
writecb: null,
writelen: 0,
bufferedRequest: null,
lastBufferedRequest: null,
pendingcb: 1,
prefinished: true,
errorEmitted: false,
bufferedRequestCount: 0,
corkedRequestsFree: [Object] },
writable: false,
_bytesDispatched: 28,
_sockname: null,
_pendingData: null,
_pendingEncoding: '',
allowHalfOpen: true,
server:
Server {
_events: [Object],
_eventsCount: 4,
_maxListeners: undefined,
_connections: 1,
_handle: [TCP],
_usingWorkers: false,
_workers: [],
_unref: false,
allowHalfOpen: true,
pauseOnConnect: false,
httpAllowHalfOpen: false,
timeout: 120000,
keepAliveTimeout: 5000,
_pendingResponseData: 0,
maxHeadersCount: null,
_connectionKey: '6::::5761',
[Symbol(IncomingMessage)]: [Function],
[Symbol(ServerResponse)]: [Function],
[Symbol(asyncId)]: 6 },
_server:
Server {
_events: [Object],
_eventsCount: 4,
_maxListeners: undefined,
_connections: 1,
_handle: [TCP],
_usingWorkers: false,
_workers: [],
_unref: false,
allowHalfOpen: true,
pauseOnConnect: false,
httpAllowHalfOpen: false,
timeout: 120000,
keepAliveTimeout: 5000,
_pendingResponseData: 0,
maxHeadersCount: null,
_connectionKey: '6::::5761',
[Symbol(IncomingMessage)]: [Function],
[Symbol(ServerResponse)]: [Function],
[Symbol(asyncId)]: 6 },
_idleTimeout: 120000,
_idleNext:
TimersList {
_idleNext: [Circular],
_idlePrev: [Circular],
_unrefed: true,
msecs: 120000,
nextTick: false,
_timer: [Timer] },
_idlePrev:
TimersList {
_idleNext: [Circular],
_idlePrev: [Circular],
_unrefed: true,
msecs: 120000,
nextTick: false,
_timer: [Timer] },
_idleStart: 25909,
_destroyed: false,
parser:
HTTPParser {
'0': [Function: parserOnHeaders],
'1': [Function: parserOnHeadersComplete],
'2': [Function: parserOnBody],
'3': [Function: parserOnMessageComplete],
'4': [Function: bound onParserExecute],
_headers: [],
_url: '',
_consumed: true,
socket: [Circular],
incoming: [IncomingMessage],
outgoing: null,
maxHeaderPairs: 2000,
onIncoming: [Function: bound parserOnIncoming] },
on: [Function: socketOnWrap],
_paused: false,
_httpMessage: [Circular],
[Symbol(asyncId)]: 32,
[Symbol(lastWriteQueueSize)]: 0,
[Symbol(bytesRead)]: 0,
[Symbol(asyncId)]: 33,
[Symbol(triggerAsyncId)]: 32 },
connection:
Socket {
connecting: false,
_hadError: false,
_handle:
TCP {
reading: true,
owner: [Circular],
onread: [Function: onread],
onconnection: null,
_consumed: true },
_parent: null,
_host: null,
_readableState:
ReadableState {
objectMode: false,
highWaterMark: 16384,
buffer: [BufferList],
length: 0,
pipes: null,
pipesCount: 0,
flowing: true,
ended: false,
endEmitted: false,
reading: true,
sync: false,
needReadable: true,
emittedReadable: false,
readableListening: false,
resumeScheduled: false,
destroyed: false,
defaultEncoding: 'utf8',
awaitDrain: 0,
readingMore: false,
decoder: null,
encoding: null },
readable: true,
_events:
{ finish: [Function: onSocketFinish],
end: [Array],
drain: [Array],
timeout: [Function: socketOnTimeout],
data: [Function: bound socketOnData],
close: [Array],
resume: [Function: onSocketResume],
pause: [Function: onSocketPause],
error: [Function] },
_eventsCount: 9,
_maxListeners: undefined,
_writableState:
WritableState {
objectMode: false,
highWaterMark: 16384,
finalCalled: false,
needDrain: false,
ending: true,
ended: true,
finished: false,
destroyed: false,
decodeStrings: false,
defaultEncoding: 'utf8',
length: 0,
writing: false,
corked: 0,
sync: false,
bufferProcessing: false,
onwrite: [Function: bound onwrite],
writecb: null,
writelen: 0,
bufferedRequest: null,
lastBufferedRequest: null,
pendingcb: 1,
prefinished: true,
errorEmitted: false,
bufferedRequestCount: 0,
corkedRequestsFree: [Object] },
writable: false,
_bytesDispatched: 28,
_sockname: null,
_pendingData: null,
_pendingEncoding: '',
allowHalfOpen: true,
server:
Server {
_events: [Object],
_eventsCount: 4,
_maxListeners: undefined,
_connections: 1,
_handle: [TCP],
_usingWorkers: false,
_workers: [],
_unref: false,
allowHalfOpen: true,
pauseOnConnect: false,
httpAllowHalfOpen: false,
timeout: 120000,
keepAliveTimeout: 5000,
_pendingResponseData: 0,
maxHeadersCount: null,
_connectionKey: '6::::5761',
[Symbol(IncomingMessage)]: [Function],
[Symbol(ServerResponse)]: [Function],
[Symbol(asyncId)]: 6 },
_server:
Server {
_events: [Object],
_eventsCount: 4,
_maxListeners: undefined,
_connections: 1,
_handle: [TCP],
_usingWorkers: false,
_workers: [],
_unref: false,
allowHalfOpen: true,
pauseOnConnect: false,
httpAllowHalfOpen: false,
timeout: 120000,
keepAliveTimeout: 5000,
_pendingResponseData: 0,
maxHeadersCount: null,
_connectionKey: '6::::5761',
[Symbol(IncomingMessage)]: [Function],
[Symbol(ServerResponse)]: [Function],
[Symbol(asyncId)]: 6 },
_idleTimeout: 120000,
_idleNext:
TimersList {
_idleNext: [Circular],
_idlePrev: [Circular],
_unrefed: true,
msecs: 120000,
nextTick: false,
_timer: [Timer] },
_idlePrev:
TimersList {
_idleNext: [Circular],
_idlePrev: [Circular],
_unrefed: true,
msecs: 120000,
nextTick: false,
_timer: [Timer] },
_idleStart: 25909,
_destroyed: false,
parser:
HTTPParser {
'0': [Function: parserOnHeaders],
'1': [Function: parserOnHeadersComplete],
'2': [Function: parserOnBody],
'3': [Function: parserOnMessageComplete],
'4': [Function: bound onParserExecute],
_headers: [],
_url: '',
_consumed: true,
socket: [Circular],
incoming: [IncomingMessage],
outgoing: null,
maxHeaderPairs: 2000,
onIncoming: [Function: bound parserOnIncoming] },
on: [Function: socketOnWrap],
_paused: false,
_httpMessage: [Circular],
[Symbol(asyncId)]: 32,
[Symbol(lastWriteQueueSize)]: 0,
[Symbol(bytesRead)]: 0,
[Symbol(asyncId)]: 33,
[Symbol(triggerAsyncId)]: 32 },
_header: 'HTTP/1.1 202 Accepted\r\nX-Powered-By: Express\r\nContent-Type: application/json; charset=utf-8\r\nContent-Length: 7\r\nETag: W/"7-7mCT8n6gALm4N/SpGscZkTFIPTE"\r\nDate: Thu, 04 Jul 2019 14:59:08 GMT\r\nConnection: keep-alive\r\n\r\n',
_onPendingData: [Function: bound updateOutgoingData],
_sent100: false,
_expect_continue: false,
req:
IncomingMessage {
_readableState:
ReadableState {
objectMode: false,
highWaterMark: 16384,
buffer: [BufferList],
length: 0,
pipes: null,
pipesCount: 0,
flowing: true,
ended: true,
endEmitted: true,
reading: false,
sync: false,
needReadable: false,
emittedReadable: false,
readableListening: false,
resumeScheduled: false,
destroyed: false,
defaultEncoding: 'utf8',
awaitDrain: 0,
readingMore: false,
decoder: null,
encoding: null },
readable: false,
_events: {},
_eventsCount: 0,
_maxListeners: undefined,
socket:
Socket {
connecting: false,
_hadError: false,
_handle: [TCP],
_parent: null,
_host: null,
_readableState: [ReadableState],
readable: true,
_events: [Object],
_eventsCount: 9,
_maxListeners: undefined,
_writableState: [WritableState],
writable: false,
_bytesDispatched: 28,
_sockname: null,
_pendingData: null,
_pendingEncoding: '',
allowHalfOpen: true,
server: [Server],
_server: [Server],
_idleTimeout: 120000,
_idleNext: [TimersList],
_idlePrev: [TimersList],
_idleStart: 25909,
_destroyed: false,
parser: [HTTPParser],
on: [Function: socketOnWrap],
_paused: false,
_httpMessage: [Circular],
[Symbol(asyncId)]: 32,
[Symbol(lastWriteQueueSize)]: 0,
[Symbol(bytesRead)]: 0,
[Symbol(asyncId)]: 33,
[Symbol(triggerAsyncId)]: 32 },
connection:
Socket {
connecting: false,
_hadError: false,
_handle: [TCP],
_parent: null,
_host: null,
_readableState: [ReadableState],
readable: true,
_events: [Object],
_eventsCount: 9,
_maxListeners: undefined,
_writableState: [WritableState],
writable: false,
_bytesDispatched: 28,
_sockname: null,
_pendingData: null,
_pendingEncoding: '',
allowHalfOpen: true,
server: [Server],
_server: [Server],
_idleTimeout: 120000,
_idleNext: [TimersList],
_idlePrev: [TimersList],
_idleStart: 25909,
_destroyed: false,
parser: [HTTPParser],
on: [Function: socketOnWrap],
_paused: false,
_httpMessage: [Circular],
[Symbol(asyncId)]: 32,
[Symbol(lastWriteQueueSize)]: 0,
[Symbol(bytesRead)]: 0,
[Symbol(asyncId)]: 33,
[Symbol(triggerAsyncId)]: 32 },
httpVersionMajor: 1,
httpVersionMinor: 1,
httpVersion: '1.1',
complete: true,
headers:
{ host: '127.0.0.1',
'content-type': 'application/json; charset=utf-8',
'content-length': '7' },
rawHeaders:
[ 'Host',
'127.0.0.1',
'Content-Type',
'application/json; charset=utf-8',
'Content-Length',
'7' ],
trailers: {},
rawTrailers: [],
upgrade: false,
url: '/latest',
method: 'POST',
statusCode: null,
statusMessage: null,
client:
Socket {
connecting: false,
_hadError: false,
_handle: [TCP],
_parent: null,
_host: null,
_readableState: [ReadableState],
readable: true,
_events: [Object],
_eventsCount: 9,
_maxListeners: undefined,
_writableState: [WritableState],
writable: false,
_bytesDispatched: 28,
_sockname: null,
_pendingData: null,
_pendingEncoding: '',
allowHalfOpen: true,
server: [Server],
_server: [Server],
_idleTimeout: 120000,
_idleNext: [TimersList],
_idlePrev: [TimersList],
_idleStart: 25909,
_destroyed: false,
parser: [HTTPParser],
on: [Function: socketOnWrap],
_paused: false,
_httpMessage: [Circular],
[Symbol(asyncId)]: 32,
[Symbol(lastWriteQueueSize)]: 0,
[Symbol(bytesRead)]: 0,
[Symbol(asyncId)]: 33,
[Symbol(triggerAsyncId)]: 32 },
_consuming: true,
_dumped: false,
next: [Function: next],
baseUrl: '',
originalUrl: '/latest',
_parsedUrl:
Url {
protocol: null,
slashes: null,
auth: null,
host: null,
port: null,
hostname: null,
hash: null,
search: null,
query: null,
pathname: '/latest',
path: '/latest',
href: '/latest',
_raw: '/latest' },
params: {},
query: {},
res: [Circular],
body: { b: 1 },
_body: true,
length: undefined,
read: [Function],
route: Route { path: '/latest', stack: [Array], methods: [Object] } },
locals: {},
statusCode: 202,
statusMessage: 'Accepted',
[Symbol(isCorked)]: false,
[Symbol(outHeadersKey)]:
{ 'x-powered-by': [ 'X-Powered-By', 'Express' ],
'content-type': [ 'Content-Type', 'application/json; charset=utf-8' ],
'content-length': [ 'Content-Length', '7' ],
etag: [ 'ETag', 'W/"7-7mCT8n6gALm4N/SpGscZkTFIPTE"' ] } }
实际的传入请求（C）如下：
POST /latest HTTP/1.1
Host: 127.0.0.1
Content-Type: application/json; charset=utf-8
Content-Length: 7
{"b":1}