MinResponseDataRate

I recently encountered a problem with one of my many Azure services. The service in question provides an API to download files from a Azure file share; this worked perfectly on some endpoints but not on others.

It took me a while to nail the issue which was due to a violation of MinResponseData rate limit in Kestrel. On endpoints with a stable Internet connection, everything was OK, but on others were the Internet connection was less stable the download frequently failed.

Even if the endpoint had OK bandwidth, the download would still fail since the connection might be gone for a few seconds. According to the docs:

MinResponseDataRate: Defaults to 240 bytes/second with a 5 second grace period.

This can be disabled by

.UseKestrel(options => options.Limits.MinResponseDataRate = null)