SendGridClient thread-safety documentation

[william-gross]

Please state in the documentation whether it is safe to create a single SendGridClient object and share it among all threads in an app domain. In particular, I'd like to know if it is safe for multiple threads in an ASP.NET application to call SendEmailAsync or RequestAsync at the same time.

I believe this was safe in version 6.3.4 (with SendGrid.Web.DeliverAsync) and it's probably still safe now (since the underlying implementation is HttpClient), but it would be nice to know for sure.

[thinkingserious]

Hello @william-gross,

While I have not done any specific testing for thread safety, I believe your assumption is correct with regards to [HttpClient](https://msdn.microsoft.com/en-us/library/system.net.http.httpclient(v=vs.110).aspx#Anchor_5).

I will leave this thread open so that we can create a test that verifies and documents thread safety with a real world example.

For this issue to gain priority in our backlog, we need additional +1's or a PR. When we receive a PR, that provides the biggest jump in priority.

With Best Regards,

Elmer

[paultechguy]

I'd like to know this as well for DI purposes.

[thinkingserious]

Thanks @paultechguy,

I've add your vote to our backlog.

[winzig]

I would also like to have this confirmed.

[thinkingserious]

Thanks for the upvote @winzig.

[alexmaie]

Another Up from me 👍 :)

[profet23]

Still no confirmation?