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I'm using Twilio API via twilio-ruby gem to list TaskRouter tasks with evaluate_task_attributes. Sometimes I get

Twilio::REST::RestError [HTTP 429] 20429 : Unable to fetch page Rate limit exceeded for target Task-List-EvaluateTaskAttributes https://www.twilio.com/docs/errors/20429

I'd like to know what exactly limits Twilio sets.

Thanks

Ilya Umanets
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1 Answers1

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Twilio developer evangelist here.

Typically the Twilio API restricts each account to 100 concurrent connections to the API and will throw 429 errors for further connections.

It is best to try to limit your connections to less than 100, but also to implement retries for 429 errors with an exponential backoff. This article on dealing with 429 Twilio errors has some further suggestions.

philnash
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    I had a comment from twilio yesterday, and they replied that they changed those limits recently, it's 1 request per second. – Ilya Umanets Aug 04 '21 at 10:43
  • In that case you should reduce your calls so that you make less than 1 per second and implement retries and back offs to make sure you can recover from that. – philnash Aug 04 '21 at 12:49