Timezone parsing errors / misbehavior about ubbagent HOT 3 OPEN

Related to this, in the example curl statement used to show how ubbagent is used, it looks like this:

date -u +"%Y-%m-%dT%H:%M:%S.%NZ"

This produces output like 2018-03-26T12:55:49.NZ which is malformed and makes ubbagent fail.

This date format string works:

date -u +"%Y-%m-%dT%H:%M:%SZ"

from ubbagent.

Date parsing errors make the HTTP agent very unhappy, it instantly closes the connection and returns nothing (not even HTTP 400*)

$ curl -v -X POST -d "{\"name\": \"requests\", \"startTime\": \"$(date -u +"%Y-%m-%dT%H:%M:%S.%NZ")\", \"endTime\": \"$(date -u +"%Y-%m-%dT%H:%M:%S.%NZ")\", \"value\": { \"int64Value\": 10 }, \"labels\": { \"foo\": \"bar2\" } }" 'http://localhost:3456/report'
Note: Unnecessary use of -X or --request, POST is already inferred.
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to localhost (127.0.0.1) port 3456 (#0)
> POST /report HTTP/1.1
> Host: localhost:3456
> User-Agent: curl/7.54.0
> Accept: */*
> Content-Length: 157
> Content-Type: application/x-www-form-urlencoded
> 
* upload completely sent off: 157 out of 157 bytes
* Empty reply from server
* Connection #0 to host localhost left intact
curl: (52) Empty reply from server

from ubbagent.

Regarding the timezone parsing error: this is a really horrible error message generated by Go's time library when parsing a timestamp in RFC3339 format. The "07:00" text comes from the format described here: https://github.com/golang/go/blob/master/src/time/format.go#L78. The message is basically telling you that a timezone is required: either "Z" or something like "+07:00". I'll see if I can wrap this in a more meaningful message.

The '%N' in the example curl command adds nanoseconds. I guess this is platform-dependent (and assume you're using OS X?). I've removed '%N' from the example commands.

And regarding the HTTP response: I'm not able to reproduce the closed connection. I get a 500 on parse error which, while not ideal, is at least a response, and is what I would expect given this line: https://github.com/GoogleCloudPlatform/ubbagent/blob/master/http/http.go#L56. Is the closed connection always reproducible for you?

from ubbagent.