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