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HER 303 See Other - HTTP_CLIENT_TIMEOUT 408 Request Time-Out - HTTP_UNAVAILABLE 503 Service Unavailable 对于这些响应码都做了处理： 1.返回null ``` if (followUp == null) { if (!forWebSocket) { streamAllocation.release(); } return response; } ``` 2.其他异常情况直接抛异常了 强调： `MAX_FOLLOW_UPS`字段， 表示最大的重定向次数 ``` /** * How many redirects and auth challenges should we attempt? Chrome follows 21 redirects; Firefox, * curl, and wget follow 20; Safari follows 16; and HTTP/1.0 recommends 5. */ private static final int MAX_FOLLOW_UPS = 20; ``` ``` if (++followUpCount > MAX_FOLLOW_UPS) { streamAllocation.release(); throw new ProtocolException("Too many follow-up requests: " + followUpCount); } ``` 这节就说到这，希望对大家有所帮助.....  大家可以关注我的微信公众号：「秦子帅」一个有质量、有态度的公众号！ 
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