duration as float?

[reedwade]

Hi, looking at the W3C doc I'm hoping that duration can be a float?

I've got a mod for that at-- https://github.com/reedwade/go-server-timing/tree/float-duration

which causes the example to emit a header that looks like:

Server-Timing: service-4;dur=66.236352,service-2;dur=31.155601,service-1;dur=67.140114,service-3;dur=41.247412,service-0;dur=70.299034

This seems a lot more useful for a lot of server side things that happen quite fast (ideally).

[kasperlewau]

@reedwade

I cherrypicked your changes and they're beautiful!

Now I get to see microseconds in the Chrome devtools as opposed to a fixed 0 value for anything less than 1ms.

[mitchellh]

This makes a ton of sense, please make your PR. :) And thank you!

It might make sense to limit to the # of decimal places to something like 2 or 3 though (chrome for example only shows 2).

[reedwade]

I'm inclined to keep the full precision as I'm also logging the header line on the server side for later review.

[mitchellh]

Fixed via #7