#ifndef _NGX_HTTP_REQUEST_H_INCLUDED_
#define _NGX_HTTP_REQUEST_H_INCLUDED_


#define NGX_HTTP_VERSION_9           9
#define NGX_HTTP_VERSION_10       1000
#define NGX_HTTP_VERSION_11       1001

#define NGX_HTTP_GET   1
#define NGX_HTTP_HEAD  2
#define NGX_HTTP_POST  3

#define NGX_HTTP_CONNECTION_CLOSE         1
#define NGX_HTTP_CONNECTION_KEEP_ALIVE    2


#define NGX_NONE                          1


#define NGX_HTTP_PARSE_HEADER_DONE        1

#define NGX_HTTP_CLIENT_ERROR             10
#define NGX_HTTP_PARSE_INVALID_METHOD     10
#define NGX_HTTP_PARSE_INVALID_REQUEST    11
#define NGX_HTTP_PARSE_TOO_LONG_URI       12
#define NGX_HTTP_PARSE_INVALID_09_METHOD  13

#define NGX_HTTP_PARSE_HEADER_ERROR       14
#define NGX_HTTP_PARSE_INVALID_HEADER     14
#define NGX_HTTP_PARSE_TOO_LONG_HEADER    15
#define NGX_HTTP_PARSE_NO_HOST_HEADER     16
#define NGX_HTTP_PARSE_INVALID_CL_HEADER  17


#define NGX_HTTP_OK                        200
#define NGX_HTTP_PARTIAL_CONTENT           206

#define NGX_HTTP_SPECIAL_RESPONSE          300
#define NGX_HTTP_MOVED_PERMANENTLY         301
#define NGX_HTTP_MOVED_TEMPORARILY         302
#define NGX_HTTP_NOT_MODIFIED              304

#define NGX_HTTP_BAD_REQUEST               400
#define NGX_HTTP_FORBIDDEN                 403
#define NGX_HTTP_NOT_FOUND                 404
#define NGX_HTTP_NOT_ALLOWED               405
#define NGX_HTTP_REQUEST_TIME_OUT          408
#define NGX_HTTP_REQUEST_ENTITY_TOO_LARGE  413
#define NGX_HTTP_REQUEST_URI_TOO_LARGE     414
#define NGX_HTTP_RANGE_NOT_SATISFIABLE     416

/*
 * HTTP does not define a code for the case when a client closed a connection
 * while we are processing request so we introduce own code to log such
 * situation when client has closed a connection before we even try to
 * send HTTP header to it
 */
#define NGX_HTTP_CLIENT_CLOSED_REQUEST     499

#define NGX_HTTP_INTERNAL_SERVER_ERROR     500
#define NGX_HTTP_NOT_IMPLEMENTED           501
#define NGX_HTTP_BAD_GATEWAY               502
#define NGX_HTTP_SERVICE_UNAVAILABLE       503
#define NGX_HTTP_GATEWAY_TIME_OUT          504


typedef enum {
    NGX_HTTP_INITING_REQUEST_STATE = 0,
    NGX_HTTP_READING_REQUEST_STATE,
    NGX_HTTP_PROCESS_REQUEST_STATE,

    NGX_HTTP_CONNECT_UPSTREAM_STATE,
    NGX_HTTP_WRITING_UPSTREAM_STATE,
    NGX_HTTP_READING_UPSTREAM_STATE,

    NGX_HTTP_WRITING_REQUEST_STATE,
    NGX_HTTP_LINGERING_CLOSE_STATE,
    NGX_HTTP_KEEPALIVE_STATE
} ngx_http_state_e;


typedef struct {
    ngx_str_t  name;
    int        offset;
} ngx_http_header_t;


typedef struct {
    ngx_table_t      *headers;   /* it must be first field */

    ngx_table_elt_t  *host;
    ngx_table_elt_t  *connection;
    ngx_table_elt_t  *if_modified_since;
    ngx_table_elt_t  *user_agent;
    ngx_table_elt_t  *referer;

    ngx_table_elt_t  *content_length;
    ngx_table_elt_t  *accept_encoding;
    ngx_table_elt_t  *range;

    ngx_table_elt_t  *authorization;

    ngx_table_elt_t  *keep_alive;

    size_t            host_name_len;
    ssize_t           content_length_n;
    size_t            connection_type;
    ssize_t           keep_alive_n;
} ngx_http_headers_in_t;


typedef struct {
    ngx_chain_t       chain[4];
    ngx_hunk_t       *header_out;
    ngx_hunk_t       *hunk;
    ngx_hunk_t       *file_hunk;
    ngx_file_t        temp_file;
    ngx_path_t       *temp_path;
    off_t             offset;
    char             *header_in_pos;
} ngx_http_request_body_t;


typedef struct {
    off_t      start;
    off_t      end;
    ngx_str_t  content_range;
} ngx_http_range_t;


typedef struct {
    ngx_table_t      *headers;   /* it must be first field */

    int               status;
    ngx_str_t         status_line;

    ngx_table_elt_t  *server;
    ngx_table_elt_t  *date;
    ngx_table_elt_t  *content_type;
    ngx_table_elt_t  *content_length;
    ngx_table_elt_t  *content_encoding;
    ngx_table_elt_t  *location;
    ngx_table_elt_t  *last_modified;
    ngx_table_elt_t  *content_range;
    ngx_table_elt_t  *accept_ranges;

    ngx_str_t         charset;
    ngx_array_t       ranges;

    off_t             content_length_n;
    char             *etag;
    time_t            date_time;
    time_t            last_modified_time;
} ngx_http_headers_out_t;


struct ngx_http_cleanup_s {
    union {
        struct {
            ngx_fd_t                 fd;
            char                    *name;
        } file;

        struct {
            ngx_http_cache_hash_t   *hash;
            ngx_http_cache_t        *cache;
        } cache;
    } data;

    unsigned                         valid:1;
    unsigned                         cache:1;
};


typedef int (*ngx_http_handler_pt)(ngx_http_request_t *r);

struct ngx_http_request_s {
    ngx_connection_t         *connection;

    void                    **ctx;
    void                    **main_conf;
    void                    **srv_conf;
    void                    **loc_conf;

    ngx_http_cache_t         *cache;

    ngx_file_t           file;

    ngx_pool_t               *pool;
    ngx_hunk_t               *header_in;
    ngx_http_request_body_t  *request_body;

    ngx_http_headers_in_t     headers_in;
    ngx_http_headers_out_t    headers_out;

    time_t               lingering_time;

    int                  method;
    int                  http_version;
    int                  http_major;
    int                  http_minor;

    ngx_str_t            request_line;
    ngx_str_t            uri;
    ngx_str_t            args;
    ngx_str_t            exten;
    ngx_str_t            unparsed_uri;

    ngx_http_request_t  *main;

    u_int                in_addr;
    int                  port;
    ngx_str_t           *port_name;    /* ":80" */
    ngx_str_t           *server_name;
    ngx_array_t         *virtual_names;

    int                  phase;
    int                  phase_handler;
    ngx_http_handler_pt  content_handler;

    ngx_temp_file_t     *temp_file;
    ngx_chain_t         *request_hunks;
    ngx_hunk_t          *request_body_hunk;
    int                  request_body_len;
    void               (*request_body_handler) (void *data); 
    void                *data;

    ngx_array_t          cleanup;

    size_t               header_size;

    char                *discarded_buffer;
    void               **err_ctx;
    int                  err_status;

    unsigned             http_state:4;

    /* URI is not started with '/' - "GET http://" */
    unsigned             unusual_uri:1;
    /* URI with "/.", "%" and on Win32 with "//" */
    unsigned             complex_uri:1;
    unsigned             header_timeout_set:1;

    unsigned             proxy:1;
    unsigned             bypass_cache:1;
    unsigned             no_cache:1;

#if 0
    unsigned             cachable:1;
#endif
    unsigned             pipeline:1;

    /* can we use sendfile ? */
    unsigned             sendfile:1;

    unsigned             chunked:1;
    unsigned             header_only:1;
    unsigned             keepalive:1;
    unsigned             lingering_close:1;
#if 0
    unsigned             closed:1;
#endif

    /* TODO: use filter or bits ???? */
    int                  filter;

    /* used to parse HTTP headers */
    int                  state;
    char                *uri_start;
    char                *uri_end;
    char                *uri_ext;
    char                *args_start;
    char                *request_start;
    char                *request_end;
    char                *header_name_start;
    char                *header_name_end;
    char                *header_start;
    char                *header_end;
};


extern ngx_http_header_t ngx_http_headers_in[];
extern ngx_http_header_t ngx_http_headers_out[];


#endif /* _NGX_HTTP_REQUEST_H_INCLUDED_ */