fix: getAllResponseHeaders 可能返回null #196
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LGTM |
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根据
The XMLHttpRequest method getAllResponseHeaders() returns all the response headers, separated by CRLF, as a string, or returns null if no response has been received.ary/CRLF), as a string, or returns null if no response has been received.
该函数是可能返回为null的，不进行判断的话会导致异常。