i used system variable called "system.timestamp" this is capturing the time but the values appears like big integer number
According to
the documentation, The time value you retrieve from system.timestamp is a nanoseconds-since-epoch.
i had to convert it Date and time format.
You didn't say how you performed the conversion. I'll suggest what I would do: use AssignMessage.
<AssignMessage name='AM-1'>
<IgnoreUnresolvedVariables>false</IgnoreUnresolvedVariables>
<AssignVariable>
<Name>formatString1</Name>
<Value>yyyy-MM-dd HH:mm:ss.SSS</Value>
</AssignVariable>
<AssignVariable>
<Name>formattedTime</Name>
<Template>{timeFormatUTCMs(formatString1,client.received.end.timestamp)}</Template>
<!-- eg, 2020-10-02 16:01:14.786 -->
</AssignVariable>
</AssignMessage><br>
That's an easy way to convert.
And your questions were:
What is the best way to capture {Request,Response} time?
I think you have to be careful about exactly what you want to measure. The variable, client.received.end.timestamp expresses the time and date at which the client request has completely arrived in the API Proxy.
Alternatively, You might want to measure... for example,... the total latency of the TARGET, including the request and the response. This is not a time-and-date value, but a timespan value, ... something like 75ms or whatever it is. Computing that would look like this:
var start, end, delta;
start = context.getVariable('target.sent.start.timestamp');
end = context.getVariable('target.received.end.timestamp');
delta = Math.floor(end - start);
context.setVariable('time-target-elapsed', delta);
If you want to measure the time consumed in the Response pipeline, which is to say, a timespan value between the time the target has sent its response, and the time before the proxy sends the first byte of response to the client, then use something like this:
var start, end, delta;
start = context.getVariable('target.received.end.timestamp');
end = context.getVariable('client.sent.start.timestamp');
delta = Math.floor(end - start);
context.setVariable('time-response-elapsed', delta);
Check the documentation for other timestamp variables that will let you get what you want. Note: some of these variables are available only in the PostClientFlow!
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