Add more logging to RestTemplate [SPR-6303]

[spring-projects-issues]

Tareq Abedrabbo opened SPR-6303 and commented

It would be nice to add more logging to RestTemplate. Particularity, logging http status codes would make debugging easier.

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Referenced from: commits db252cd

[spring-projects-issues]

Arjen Poutsma commented

Added status code logging on debug level for normal cases, and warning level for errors (4xx & 5xx).