Provide meaningful error messages if some API limits are reached

[shuron]

Issue Summary

This is the stacktrace of the exception i get when i trying to send message with subject longer than 87 chars...

org.apache.http.client.HttpResponseException: Unsupported Media Type
    at org.apache.http.impl.client.AbstractResponseHandler.handleResponse(AbstractResponseHandler.java:69) ~[httpclient-4.5.2.jar:4.5.2]
    at org.apache.http.impl.client.BasicResponseHandler.handleResponse(BasicResponseHandler.java:65) ~[httpclient-4.5.2.jar:4.5.2]
    at org.apache.http.impl.client.BasicResponseHandler.handleResponse(BasicResponseHandler.java:51) ~[httpclient-4.5.2.jar:4.5.2]
    at com.sendgrid.Client.getResponse(Client.java:138) ~[java-http-client-2.3.2.jar:na]
    at com.sendgrid.Client.post(Client.java:217) ~[java-http-client-2.3.2.jar:na]
    at com.sendgrid.Client.api(Client.java:369) ~[java-http-client-2.3.2.jar:na]
    at com.sendgrid.SendGrid.makeCall(SendGrid.java:92) ~[sendgrid-java-3.0.6.jar:na]
    at com.sendgrid.SendGrid.api(SendGrid.java:111) ~[sendgrid-java-3.0.6.jar:na]

Technical details:

• sendgrid-java Version: release 3.0.6
• Java Version: 8

[shuron]

I just figured out that this is even more stranger
i cannot send message with subject:

"ффффффффффззззззззззннннннннннффффффффффззззззззззннннннннннффффффффффззззззззззщщщщщххasssss ssssssss dhdhdhdhdhd hdhd dh h ddh "

or

"ффффффффффззззззззззннннннннннффффффффффззззззззззннннннннннффффффффффззззззззззщщщщщххasssss ssssssss dhdhdhdhdhd hdhd dh h ddh."

or

"ффффффффффззззззззззннннннннннффффффффффззззззззззннннннннннффффффффффззззззззззщщщщщххasssss ssssssss dhdhdhdhdhd hdhd dh h ddh!"

but succesfully send:

"ффффффффффззззззззззннннннннннффффффффффззззззззззннннннннннффффффффффззззззззззщщщщщххasssss ssssssss dhdhdhdhdhd hdhd dh h ddh"

without trailing space or dot or exclamation mark

[thinkingserious]

Hi @shuron!

Thanks for the feedback!

Regarding the error messages, we are tracking that one here: sendgrid/java-http-client#10. I'll add your vote to get that moved up our internal queue.

I believe you are being bitten by this bug: sendgrid/sendgrid-csharp#262

The fix should be deploying any day now.