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这些状态码是严格按照 HTTP协议标准文档——RFC2616 编写的，可能很多并未使用上，但为了向后兼容，还是全部写上去了。
typedef enum http_response_status {
http_response_status_continue = 100, /* informational 1xx */
http_response_status_switching_protocols = 101,
http_response_status_ok = 200, /* successful 2xx */
http_response_status_created = 201,
http_response_status_accepted = 202,
http_response_status_non_authoritative_information = 203,
http_response_status_no_content = 204,
http_response_status_reset_content = 205,
http_response_status_partial_content = 206,
http_response_status_multiple_choices = 300, /* redirection 3xx */
http_response_status_moved_permanently = 301,
http_response_status_found = 302,
http_response_status_see_ther = 303,
http_response_status_not_modified = 304,
http_response_status_use_proxy = 305,
http_response_status_unused = 306, /* unused */
http_response_status_temporary_redirect = 307,
http_response_status_bad_request = 400, /* client error 4xx */
http_response_status_unauthorized = 401,
http_response_status_payment_required = 402, /* this code is reserved for future use */
http_response_status_forbidden = 403,
http_response_status_not_found = 404,
http_response_status_method_not_allowed = 405,
http_response_status_not_acceptable = 406,
http_response_status_proxy_authentication_required = 407,
http_response_status_request_timeout = 408,
http_response_status_conflict = 409,
http_response_status_gone = 410,
http_response_status_length_required = 411,
http_response_status_precondition_failed = 412,
http_response_status_request_entity_too_large = 413,
http_response_status_request_uri_too_long = 414,
http_response_status_unsupported_media_type = 415,
http_response_status_requested_range_not_satisfiable = 416,
http_response_status_expectation_failed = 417,
http_response_status_internal_server_error = 500, /* server error 5xx */
http_response_status_not_implemented = 501,
http_response_status_bad_gateway = 502,
http_response_status_service_unavailable = 503,
http_response_status_gateway_timeout = 504,
http_response_status_http_version_not_supported = 505,
} http_response_status_t;
typedef struct http_response {
uint64_t length; /* content length */
uint32_t offset; /* data offset, skip header */
http_response_status_t status; /* response status code */
http_message_buffer_t *message;
} http_response_t;
应答报文要保存应答的状态码，是否为大块数据，数据的长度，偏移字段（主要是用于跳过头部字段），以及最重要的请求报文数据保存区域，通过 http_message_buffer_t 结构可以支持请求报文动态变化，当内存不足时自动增长内存。
初始化一个响应结构，主要是调用 http_message_buffer_init() 函数去申请响应报文的内存空间，默认为 HTTP_MESSAGE_BUFFER_GROWTH。
int http_response_init(http_response_t *rsp);
释放一个 http 响应结构，因为在初始化时动态申请了内存，在释放的时候需要使用 http_message_buffer_release() 函数去释放内存。
int http_response_release(http_response_t *rsp);
设置 / 获取 响应结构中的相关信息，如长度、偏移字段、状态等，ps：状态是使用无符号整形数据，但会被转换为 http_response_status_t 类型。
uint64_t http_response_get_length(http_response_t *rsp);
void http_response_set_length(http_response_t *rsp, uint64_t length);
uint32_t http_response_get_offset(http_response_t *rsp);
void http_response_set_offset(http_response_t *rsp, uint32_t offset);
http_response_status_t http_response_get_status(http_response_t *rsp);
void http_response_set_status(http_response_t *rsp, unsigned int status);
通过响应结构获取相关内容，比如获取报文，报文内部的数据、body、以及长度等，这些封装是为了比较严格的分层，在禁止在外部私自访问响应结构的私有变量。
http_message_buffer_t *http_response_get_message(http_response_t *rsp);
char *http_response_get_message_data(http_response_t *rsp);
char *http_response_get_message_body(http_response_t *rsp);
size_t http_response_get_message_len(http_response_t *rsp);
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