/** A structure that represents the current request */
struct request_rec {
    /** The pool associated with the request */
    apr_pool_t *pool;
    /** The connection over which this connection has been read */
    conn_rec *connection;
    /** The virtual host this request is for */
    server_rec *server;

    /** If we wind up getting redirected, pointer to the request we 
     *  redirected to.  */
    request_rec *next;
    /** If this is an internal redirect, pointer to where we redirected 
     *  *from*.  */
    request_rec *prev;

    /** If this is a sub_request (see request.h) pointer back to the 
     *  main request.  */
    request_rec *main;

    /* Info about the request itself... we begin with stuff that only
     * protocol.c should ever touch...
     */
    /** First line of request, so we can log it */
    char *the_request;
    /** HTTP/0.9, "simple" request */
    int assbackwards;
    /** A proxy request (calculated during post_read_request/translate_name)
     *  possible values PROXYREQ_NONE, PROXYREQ_PROXY, PROXYREQ_REVERSE
     */
    int proxyreq;
    /** HEAD request, as opposed to GET */
    int header_only;
    /** Protocol, as given to us, or HTTP/0.9 */
    char *protocol;
    /** Number version of protocol; 1.1 = 1001 */
    int proto_num;
    /** Host, as set by full URI or Host: */
    const char *hostname;

    /** When the request started */
    apr_time_t request_time;

    /** Status line, if set by script */
    const char *status_line;
    /** In any case */
    int status;

    /* Request method, two ways; also, protocol, etc..  Outside of protocol.c,
     * look, but don't touch.
     */

    /** GET, HEAD, POST, etc. */
    const char *method;
    /** M_GET, M_POST, etc. */
    int method_number;

    /**
     *  allowed is a bitvector of the allowed methods.
     *
     *  A handler must ensure that the request method is one that
     *  it is capable of handling.  Generally modules should DECLINE
     *  any request methods they do not handle.  Prior to aborting the
     *  handler like this the handler should set r->allowed to the list
     *  of methods that it is willing to handle.  This bitvector is used
     *  to construct the "Allow:" header required for OPTIONS requests,
     *  and HTTP_METHOD_NOT_ALLOWED and HTTP_NOT_IMPLEMENTED status codes.
     *
     *  Since the default_handler deals with OPTIONS, all modules can
     *  usually decline to deal with OPTIONS.  TRACE is always allowed,
     *  modules don't need to set it explicitly.
     *
     *  Since the default_handler will always handle a GET, a
     *  module which does *not* implement GET should probably return
     *  HTTP_METHOD_NOT_ALLOWED.  Unfortunately this means that a Script GET
     *  handler can't be installed by mod_actions.
     */
    int allowed;
    /** Array of extension methods */
    apr_array_header_t *allowed_xmethods; 
    /** List of allowed methods */
    ap_method_list_t *allowed_methods; 

    /** byte count in stream is for body */
    int sent_bodyct;
    /** body byte count, for easy access */
    long bytes_sent;
    /** Time the resource was last modified */
    apr_time_t mtime;

    /* HTTP/1.1 connection-level features */

    /** sending chunked transfer-coding */
    int chunked;
    /** multipart/byteranges boundary */
    const char *boundary;
    /** The Range: header */
    const char *range;
    /** The "real" content length */
    apr_off_t clength;

    /** bytes left to read */
    apr_size_t remaining;
    /** bytes that have been read */
    long read_length;
    /** how the request body should be read */
    int read_body;
    /** reading chunked transfer-coding */
    int read_chunked;
    /** is client waiting for a 100 response? */
    unsigned expecting_100;

    /* MIME header environments, in and out.  Also, an array containing
     * environment variables to be passed to subprocesses, so people can
     * write modules to add to that environment.
     *
     * The difference between headers_out and err_headers_out is that the
     * latter are printed even on error, and persist across internal redirects
     * (so the headers printed for ErrorDocument handlers will have them).
     *
     * The 'notes' apr_table_t is for notes from one module to another, with no
     * other set purpose in mind...
     */

    /** MIME header environment from the request */
    apr_table_t *headers_in;
    /** MIME header environment for the response */
    apr_table_t *headers_out;
    /** MIME header environment for the response, printed even on errors and
     * persist across internal redirects */
    apr_table_t *err_headers_out;
    /** Array of environment variables to be used for sub processes */
    apr_table_t *subprocess_env;
    /** Notes from one module to another */
    apr_table_t *notes;

    /* content_type, handler, content_encoding, content_language, and all
     * content_languages MUST be lowercased strings.  They may be pointers
     * to static strings; they should not be modified in place.
     */
    /** The content-type for the current request */
    const char *content_type;	/* Break these out --- we dispatch on 'em */
    /** The handler string that we use to call a handler function */
    const char *handler;	/* What we *really* dispatch on           */

    /** How to encode the data */
    const char *content_encoding;
    /** for back-compat. only -- do not use */
    const char *content_language;
    /** array of (char*) representing the content languages */
    apr_array_header_t *content_languages;

    /** variant list validator (if negotiated) */
    char *vlist_validator;
    
    /** If an authentication check was made, this gets set to the user name. */
    char *user;	
    /** If an authentication check was made, this gets set to the auth type. */
    char *ap_auth_type;

    /** This response is non-cache-able */
    int no_cache;
    /** There is no local copy of this response */
    int no_local_copy;

    /* What object is being requested (either directly, or via include
     * or content-negotiation mapping).
     */

    /** the uri without any parsing performed */
    char *unparsed_uri;	
    /** the path portion of the URI */
    char *uri;
    /** The filename on disk that this response corresponds to */
    char *filename;
    /** The path_info for this request if there is any. */
    char *path_info;
    /** QUERY_ARGS, if any */
    char *args;	
    /** ST_MODE set to zero if no such file */
    apr_finfo_t finfo;
    /** components of uri, dismantled */
    apr_uri_components parsed_uri;

    /* Various other config info which may change with .htaccess files
     * These are config vectors, with one void* pointer for each module
     * (the thing pointed to being the module's business).
     */

    /** Options set in config files, etc. */
    struct ap_conf_vector_t *per_dir_config;
    /** Notes on *this* request */
    struct ap_conf_vector_t *request_config;

/**
 * a linked list of the configuration directives in the .htaccess files
 * accessed by this request.
 * N.B. always add to the head of the list, _never_ to the end.
 * that way, a sub request's list can (temporarily) point to a parent's list
 */
    const struct htaccess_result *htaccess;

    /** A list of output filters to be used for this request */
    struct ap_filter_t *output_filters;
    /** A list of input filters to be used for this request */
    struct ap_filter_t *input_filters;
    /** A flag to determine if the eos bucket has been sent yet */
    int eos_sent;

/* Things placed at the end of the record to avoid breaking binary
 * compatibility.  It would be nice to remember to reorder the entire
 * record to improve 64bit alignment the next time we need to break
 * binary compatibility for 

some other reason.
 */
};

20.5. Per-Directory Configuration		20.7. Access to Configuration and Request Information