/**
Constants
int HTTP_ACCEPTED Numeric status code, 202: Accepted
int HTTP_BAD_GATEWAY Numeric status code, 502: Bad Gateway
int HTTP_BAD_METHOD Numeric status code, 405: Bad Method
int HTTP_BAD_REQUEST Numeric status code, 400: Bad Request
int HTTP_CLIENT_TIMEOUT Numeric status code, 408: Client Timeout
int HTTP_CONFLICT Numeric status code, 409: Conflict
int HTTP_CREATED Numeric status code, 201: Created
int HTTP_ENTITY_TOO_LARGE Numeric status code, 413: Entity too large
int HTTP_FORBIDDEN Numeric status code, 403: Forbidden
int HTTP_GATEWAY_TIMEOUT Numeric status code, 504: Gateway timeout
int HTTP_GONE Numeric status code, 410: Gone
int HTTP_INTERNAL_ERROR Numeric status code, 500: Internal error
int HTTP_LENGTH_REQUIRED Numeric status code, 411: Length required
int HTTP_MOVED_PERM Numeric status code, 301 Moved permanently
int HTTP_MOVED_TEMP Numeric status code, 302: Moved temporarily
int HTTP_MULT_CHOICE Numeric status code, 300: Multiple choices
int HTTP_NOT_ACCEPTABLE Numeric status code, 406: Not acceptable
int HTTP_NOT_AUTHORITATIVE Numeric status code, 203: Not authoritative
int HTTP_NOT_FOUND Numeric status code, 404: Not found
int HTTP_NOT_IMPLEMENTED Numeric status code, 501: Not implemented
int HTTP_NOT_MODIFIED Numeric status code, 304: Not modified
int HTTP_NO_CONTENT Numeric status code, 204: No content
int HTTP_OK Numeric status code, 200: OK
int HTTP_PARTIAL Numeric status code, 206: Partial
int HTTP_PAYMENT_REQUIRED Numeric status code, 402: Payment required
int HTTP_PRECON_FAILED Numeric status code, 412: Precondition failed
int HTTP_PROXY_AUTH Numeric status code, 407: Proxy authentication required
int HTTP_REQ_TOO_LONG Numeric status code, 414: Request too long
int HTTP_RESET Numeric status code, 205: Reset
int HTTP_SEE_OTHER Numeric status code, 303: See other
int HTTP_SERVER_ERROR This constant was deprecated in API level 1. Use HTTP_INTERNAL_ERROR instead.
int HTTP_UNAUTHORIZED Numeric status code, 401: Unauthorized
int HTTP_UNAVAILABLE Numeric status code, 503: Unavailable
int HTTP_UNSUPPORTED_TYPE Numeric status code 415: Unsupported type
int HTTP_USE_PROXY Numeric status code, 305: Use proxy.
int HTTP_VERSION Numeric status code, 505: Version not supported
*/
来源：oschina
链接：https://my.oschina.net/u/166646/blog/547512