fastify-response-time-too
v2.1.0
Published
Add X-Response-Time header at each request (in ms) for Fastify
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fastify-response-time
Add X-Response-Time
header at each request for Fastify. The unit used is milliseconds.
Add Server-Timing
header, that could be used to pass timing server to client (useful to debug).
You could find some documentation at W3C Server-Timing documentation.
You need to use Fastify version 0.31 or newer, the hook used (onSend) was added in this version
If you need older Fastify version, use version 1.0.1 of this plugin
Install
npm install --save fastify-response-time
Usage
Add it to you project with register
and you are done!
// Register the plugin
fastify.register(require("fastify-response-time"));
// Define a new route in hapijs notation
fastify.route({
method: "GET",
url: "/header-hapi",
handler: (request, reply) => {
reply.send();
}
});
// Define a new route in express notation
fastify.get("/header-express", (request, reply) => {
reply.send();
});
// Add server timing information
fastify.get("/header-express", (request, reply) => {
reply.setServerTiming("cache", 5.3, "Cache read");
reply.send();
});
Both examples responds with:
< HTTP/1.1 200 OK
< Content-Type: application/json
< Content-Length: 17
< X-Response-Time: 0.08
< Date: Fri, 15 Sep 2017 21:14:33 GMT
< Connection: keep-alive
<
Options
This plugin allow you to specify options:
header
can be used to change default header name to something else (X-Response-Time
by default)digits
to specify the number of digits in the response (2
by default, so 1.03)
reply.setServerTiming
usage
reply.setServerTiming( name , duration , description ) => boolean
With:
name
: [mandatory] the name of the measure, and must be unique. Any already existing value will not be replacedduration
: [optional] the duration, that must be an integer or float. If not needed, pass0
ornull
description
: [optional] the description is needed. It must be a string- return
true
if the measure is added the the list that will be send with the request,false
is the name already exists
The response will be:
< HTTP/1.1 200 OK
< Content-Type: application/json
< Content-Length: 17
< X-Response-Time: 0.08
< Server-Timing: cache;dur=5.3;desc="Cache read"
< Date: Fri, 15 Sep 2017 21:14:33 GMT
< Connection: keep-alive
<