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Hutool是一个小而全的Java工具类库，通过静态方法封装，降低相关API的学习成本，提高工作效率，使Java拥有函数式语言般的优雅，让Java语言也可以“甜甜的”。
There is a newer version: 5.8.34
package cn.hutool.http;

/**
 * HTTP状态码
 *
 * @author Looly
 * @author Ningqingsheng
 * @see java.net.HttpURLConnection
 *
 */
public class HttpStatus {

	/* 1XX: Informational */

	/**
	 * HTTP Status-Code 100: Continue.
	 */
	public static final int HTTP_CONTINUE = 100;

	/**
	 * HTTP Status-Code 101: Switching Protocols.
	 */
	public static final int HTTP_SWITCHING_PROTOCOLS = 101;

	/**
	 * HTTP Status-Code 102: Processing.
	 */
	public static final int HTTP_PROCESSING = 102;

	/**
	 * HTTP Status-Code 103: Checkpoint.
	 */
	public static final int HTTP_CHECKPOINT = 103;

	/* 2XX: generally "OK" */

	/**
	 * HTTP Status-Code 200: OK.
	 */
	public static final int HTTP_OK = 200;

	/**
	 * HTTP Status-Code 201: Created.
	 */
	public static final int HTTP_CREATED = 201;

	/**
	 * HTTP Status-Code 202: Accepted.
	 */
	public static final int HTTP_ACCEPTED = 202;

	/**
	 * HTTP Status-Code 203: Non-Authoritative Information.
	 */
	public static final int HTTP_NOT_AUTHORITATIVE = 203;

	/**
	 * HTTP Status-Code 204: No Content.
	 */
	public static final int HTTP_NO_CONTENT = 204;

	/**
	 * HTTP Status-Code 205: Reset Content.
	 */
	public static final int HTTP_RESET = 205;

	/**
	 * HTTP Status-Code 206: Partial Content.
	 */
	public static final int HTTP_PARTIAL = 206;

	/**
	 * HTTP Status-Code 207: Multi-Status.
	 */
	public static final int HTTP_MULTI_STATUS = 207;

	/**
	 * HTTP Status-Code 208: Already Reported.
	 */
	public static final int HTTP_ALREADY_REPORTED = 208;

	/**
	 * HTTP Status-Code 226: IM Used.
	 */
	public static final int HTTP_IM_USED = 226;

	/* 3XX: relocation/redirect */

	/**
	 * HTTP Status-Code 300: Multiple Choices.
	 */
	public static final int HTTP_MULT_CHOICE = 300;

	/**
	 * HTTP Status-Code 301: Moved Permanently.
	 */
	public static final int HTTP_MOVED_PERM = 301;

	/**
	 * HTTP Status-Code 302: Temporary Redirect.
	 */
	public static final int HTTP_MOVED_TEMP = 302;

	/**
	 * HTTP Status-Code 303: See Other.
	 */
	public static final int HTTP_SEE_OTHER = 303;

	/**
	 * HTTP Status-Code 304: Not Modified.
	 */
	public static final int HTTP_NOT_MODIFIED = 304;

	/**
	 * HTTP Status-Code 305: Use Proxy.
	 */
	public static final int HTTP_USE_PROXY = 305;

	/**
	 * HTTP 1.1 Status-Code 307: Temporary Redirect.

	 * 见：RFC-7231
	 */
	public static final int HTTP_TEMP_REDIRECT = 307;

	/**
	 * HTTP 1.1 Status-Code 308: Permanent Redirect 永久重定向

	 * 见：RFC-7231
	 */
	public static final int HTTP_PERMANENT_REDIRECT = 308;

	/* 4XX: client error */

	/**
	 * HTTP Status-Code 400: Bad Request.
	 */
	public static final int HTTP_BAD_REQUEST = 400;

	/**
	 * HTTP Status-Code 401: Unauthorized.
	 */
	public static final int HTTP_UNAUTHORIZED = 401;

	/**
	 * HTTP Status-Code 402: Payment Required.
	 */
	public static final int HTTP_PAYMENT_REQUIRED = 402;

	/**
	 * HTTP Status-Code 403: Forbidden.
	 */
	public static final int HTTP_FORBIDDEN = 403;

	/**
	 * HTTP Status-Code 404: Not Found.
	 */
	public static final int HTTP_NOT_FOUND = 404;

	/**
	 * HTTP Status-Code 405: Method Not Allowed.
	 */
	public static final int HTTP_BAD_METHOD = 405;

	/**
	 * HTTP Status-Code 406: Not Acceptable.
	 */
	public static final int HTTP_NOT_ACCEPTABLE = 406;

	/**
	 * HTTP Status-Code 407: Proxy Authentication Required.
	 */
	public static final int HTTP_PROXY_AUTH = 407;

	/**
	 * HTTP Status-Code 408: Request Time-Out.
	 */
	public static final int HTTP_CLIENT_TIMEOUT = 408;

	/**
	 * HTTP Status-Code 409: Conflict.
	 */
	public static final int HTTP_CONFLICT = 409;

	/**
	 * HTTP Status-Code 410: Gone.
	 */
	public static final int HTTP_GONE = 410;

	/**
	 * HTTP Status-Code 411: Length Required.
	 */
	public static final int HTTP_LENGTH_REQUIRED = 411;

	/**
	 * HTTP Status-Code 412: Precondition Failed.
	 */
	public static final int HTTP_PRECON_FAILED = 412;

	/**
	 * HTTP Status-Code 413: Request Entity Too Large.
	 */
	public static final int HTTP_ENTITY_TOO_LARGE = 413;

	/**
	 * HTTP Status-Code 414: Request-URI Too Large.
	 */
	public static final int HTTP_REQ_TOO_LONG = 414;

	/**
	 * HTTP Status-Code 415: Unsupported Media Type.
	 */
	public static final int HTTP_UNSUPPORTED_TYPE = 415;

	/**
	 * HTTP Status-Code 416: Requested Range Not Satisfiable.
	 */
	public static final int HTTP_REQUESTED_RANGE_NOT_SATISFIABLE = 416;

	/**
	 * HTTP Status-Code 417: Expectation Failed.
	 */
	public static final int HTTP_EXPECTATION_FAILED = 417;

	/**
	 * HTTP Status-Code 418: I'm a teapot.
	 */
	public static final int HTTP_I_AM_A_TEAPOT = 418;

	/**
	 * HTTP Status-Code 422: Unprocessable Entity.
	 */
	public static final int HTTP_UNPROCESSABLE_ENTITY = 422;

	/**
	 * HTTP Status-Code 423: Locked.
	 */
	public static final int HTTP_LOCKED = 423;

	/**
	 * HTTP Status-Code 424: Failed Dependency.
	 */
	public static final int HTTP_FAILED_DEPENDENCY = 424;

	/**
	 * HTTP Status-Code 425: Too Early.
	 */
	public static final int HTTP_TOO_EARLY = 425;

	/**
	 * HTTP Status-Code 426: Upgrade Required.
	 */
	public static final int HTTP_UPGRADE_REQUIRED = 426;

	/**
	 * HTTP Status-Code 428: Precondition Required.
	 */
	public static final int HTTP_PRECONDITION_REQUIRED = 428;

	/**
	 * HTTP Status-Code 429: Too Many Requests.
	 */
	public static final int HTTP_TOO_MANY_REQUESTS = 429;

	/**
	 * HTTP Status-Code 431: Request Header Fields Too Large.
	 */
	public static final int HTTP_REQUEST_HEADER_FIELDS_TOO_LARGE = 431;

	/**
	 * HTTP Status-Code 451: Unavailable For Legal Reasons.
	 */
	public static final int HTTP_UNAVAILABLE_FOR_LEGAL_REASONS = 451;

	/* 5XX: server error */

	/**
	 * HTTP Status-Code 500: Internal Server Error.
	 */
	public static final int HTTP_INTERNAL_ERROR = 500;

	/**
	 * HTTP Status-Code 501: Not Implemented.
	 */
	public static final int HTTP_NOT_IMPLEMENTED = 501;

	/**
	 * HTTP Status-Code 502: Bad Gateway.
	 */
	public static final int HTTP_BAD_GATEWAY = 502;

	/**
	 * HTTP Status-Code 503: Service Unavailable.
	 */
	public static final int HTTP_UNAVAILABLE = 503;

	/**
	 * HTTP Status-Code 504: Gateway Timeout.
	 */
	public static final int HTTP_GATEWAY_TIMEOUT = 504;

	/**
	 * HTTP Status-Code 505: HTTP Version Not Supported.
	 */
	public static final int HTTP_VERSION = 505;

	/**
	 * HTTP Status-Code 506: Variant Also Negotiates.
	 */
	public static final int HTTP_VARIANT_ALSO_NEGOTIATES = 506;

	/**
	 * HTTP Status-Code 507: Insufficient Storage.
	 */
	public static final int HTTP_INSUFFICIENT_STORAGE = 507;

	/**
	 * HTTP Status-Code 508: Loop Detected.
	 */
	public static final int HTTP_LOOP_DETECTED = 508;

	/**
	 * HTTP Status-Code 509: Bandwidth Limit Exceeded.
	 */
	public static final int HTTP_BANDWIDTH_LIMIT_EXCEEDED = 509;

	/**
	 * HTTP Status-Code 510: Not Extended.
	 */
	public static final int HTTP_NOT_EXTENDED = 510;

	/**
	 * HTTP Status-Code 511: Network Authentication Required.
	 */
	public static final int HTTP_NETWORK_AUTHENTICATION_REQUIRED = 511;

	/**
	 * 是否为重定向状态码
	 * @param responseCode 被检查的状态码
	 * @return 是否为重定向状态码
	 * @since 5.6.3
	 */
	public static boolean isRedirected(int responseCode){
		return responseCode == HTTP_MOVED_PERM
				|| responseCode == HTTP_MOVED_TEMP
				|| responseCode == HTTP_SEE_OTHER
				// issue#1504@Github，307和308是RFC 7538中http 1.1定义的规范
				|| responseCode == HTTP_TEMP_REDIRECT
				|| responseCode == HTTP_PERMANENT_REDIRECT;

	}
}