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# http-timer
> Timings for HTTP requests
[](https://travis-ci.org/szmarczak/http-timer)
[](https://coveralls.io/github/szmarczak/http-timer?branch=master)
[](https://packagephobia.now.sh/result?p=@szmarczak/http-timer)
Inspired by the [`request` package](https://github.com/request/request).
## Installation
NPM:
> `npm install @szmarczak/http-timer`
Yarn:
> `yarn add @szmarczak/http-timer`
## Usage
**Note:**
> - The measured events resemble Node.js events, not the kernel ones.
> - Sending a chunk greater than [`highWaterMark`](https://nodejs.org/api/stream.html#stream_new_stream_writable_options) will result in invalid `upload` and `response` timings. You can avoid this by splitting the payload into smaller chunks.
```js
import https from 'https';
import timer from '@szmarczak/http-timer';
const request = https.get('https://httpbin.org/anything');
timer(request);
request.once('response', response => {
response.resume();
response.once('end', () => {
console.log(response.timings); // You can use `request.timings` as well
});
});
// {
// start: 1572712180361,
// socket: 1572712180362,
// lookup: 1572712180415,
// connect: 1572712180571,
// upload: 1572712180884,
// response: 1572712181037,
// end: 1572712181039,
// error: undefined,
// abort: undefined,
// phases: {
// wait: 1,
// dns: 53,
// tcp: 156,
// request: 313,
// firstByte: 153,
// download: 2,
// total: 678
// }
// }
```
## API
### timer(request)
Returns: `Object`
**Note**: The time is a `number` representing the milliseconds elapsed since the UNIX epoch.
- `start` - Time when the request started.
- `socket` - Time when a socket was assigned to the request.
- `lookup` - Time when the DNS lookup finished.
- `connect` - Time when the socket successfully connected.
- `secureConnect` - Time when the socket securely connected.
- `upload` - Time when the request finished uploading.
- `response` - Time when the request fired `response` event.
- `end` - Time when the response fired `end` event.
- `error` - Time when the request fired `error` event.
- `abort` - Time when the request fired `abort` event.
- `phases`
- `wait` - `timings.socket - timings.start`
- `dns` - `timings.lookup - timings.socket`
- `tcp` - `timings.connect - timings.lookup`
- `tls` - `timings.secureConnect - timings.connect`
- `request` - `timings.upload - (timings.secureConnect || timings.connect)`
- `firstByte` - `timings.response - timings.upload`
- `download` - `timings.end - timings.response`
- `total` - `(timings.end || timings.error || timings.abort) - timings.start`
If something has not been measured yet, it will be `undefined`.
## License
MIT
|
