update readme in the Handling Errors section - issue reference #5260 #5261
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Adding clarification to the Handling Errors section - issue reference #5260
add a sentence about the default behavior of the rejected status code.
"the default behavior is to reject every response that returns with a status code that falls out of the range of 2xx and treat it as an error."
and make a small addition to the validateStatus header, to explain what the default condition.
Using the validateStatus config option, you can override the default condition (status >= 200 && status < 300) and define HTTP code(s) that should throw an error.