Anika Solanka opened SPR-16371 and commented

ResponseEntityResponseExtractor in version 4.3.13 also has a problem with unknown HTTP status codes. It is calling response.getStatusCode() which throws IllegalArgumentException for unknown status codes.

Affects: 4.3.13

Issue Links:

• RestTemplate doesn't consistently tolerate unknown HTTP status codes [SPR-15978] #20529 RestTemplate doesn't consistently tolerate unknown HTTP status codes
• DefaultResponseErrorHandler.hasError doesn't tolerate unknown status codes [SPR-16108] #20656 DefaultResponseErrorHandler.hasError doesn't tolerate unknown status codes
• RestTemplate does not throw exception for custom error codes [SPR-17439] #21971 RestTemplate does not throw exception for custom error codes

Referenced from: commits c1bc74c