version : Tyk API Gateway 5.0.7
Is there a problem with the request body or does the gateway have any configuration to control it?
@Ch1Yua Hello and welcome to the community 
No there isn’t. The change occurred from v5.0.4
Fixed a security bug where the key_id was unnecessarily returned when a hashed key is
created for an API using basic auth.
Do you by chance have hash_keys enabled in the config or environment variable?
Regardless, your basic auth should still work as expected
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