Location Header

The Location header is used to redirect the recipient to a location other than the Request-URI for completion of the request or identification of a new resource. More...

Defines
#define	HTTP_LOCATION_INIT()
	Initializer for structure http_location_t.
#define	HTTPTAG_LOCATION(x)
	Tag list item for pointer to a Location header object.
#define	HTTPTAG_LOCATION_STR(s)
	Tag list item for string with Location header value.
Typedefs
typedef struct http_location_s	http_location_t
	The structure http_location_t contains representation of Location header.
Enumerations
enum	{ http_location_hash }
Functions
http_location_t *	http_location_init (http_location_t x[1])
	Initialize a structure http_location_t.
int	http_is_location (http_header_t const *header)
	Test if header object is instance of http_location_t.
http_location_t *	http_location_dup (su_home_t *home, http_location_t const *hdr))
	Duplicate (deep copy) http_location_t.
http_location_t *	http_location_copy (su_home_t *home, http_location_t const *hdr))
	Copy a http_location_t header structure.
http_location_t *	http_location_make (su_home_t *home, char const *s))
	Make a header structure http_location_t.
http_location_t *	http_location_format (su_home_t *home, char const *fmt,...)))
	Make a Location header from formatting result.
Variables
msg_hclass_t	http_location_class []
	Header class for HTTP Location header.
msg_parse_f	http_location_d
	Decode (parse) a Location header.
msg_print_f	http_location_e
	Encode (print) a Location header.

---

Detailed Description

The Location header is used to redirect the recipient to a location other than the Request-URI for completion of the request or identification of a new resource.

Its syntax is defined in RFC 2616 section 14.30 as follows:

    Location       = "Location" ":" absoluteURI

---

Define Documentation

#define HTTP_LOCATION_INIT

(

)

Initializer for structure http_location_t.

A static http_location_t structure must be initialized with the HTTP_LOCATION_INIT() macro. For instance,

  http_location_t http_location = HTTP_LOCATION_INIT;

#define HTTPTAG_LOCATION

(

x

)

Tag list item for pointer to a Location header object.

The HTTPTAG_LOCATION() macro is used to include a tag item with a pointer to a http_location_t object in a tag list.

Parameters:

x

pointer to a http_location_t header structure, or NULL.

#define HTTPTAG_LOCATION_STR

(

s

)

Tag list item for string with Location header value.

The HTTPTAG_LOCATION_STR() macro is used to include a tag item with a string containing value of a http_location_t header in a tag list.

Parameters:

s

pointer to a string containing http_location_t value, or NULL.

The HTTPTAG_LOCATION_STR string can be converted to a http_location_t header structure by giving the string s has second argument to function http_location_make().

---

Typedef Documentation

typedef struct http_location_s http_location_t

The structure http_location_t contains representation of Location header.

The http_location_t is defined as follows:

 typedef struct http_location_s
 {
   msg_common_t         loc_common[1];
   msg_error_t         *loc_next;
   url_t                loc_url[1];
 } http_location_t;

---

Enumeration Type Documentation

anonymous enum

Enumerator:

http_location_hash

Hash of Location header.

---

Function Documentation

int http_is_location

(

http_header_t const *

header

)

[inline]

Test if header object is instance of http_location_t.

The function http_is_location() returns true (nonzero) if the header class is an instance of Location header object and false (zero) otherwise.

Parameters:

header

pointer to the header structure to be tested

Returns:

The function http_is_xlocation() returns true (nonzero) if the header object is an instance of header location and false (zero) otherwise.

http_location_t * http_location_copy	(	su_home_t *	home,
		http_location_t const *	hdr
	)			[inline]

Copy a http_location_t header structure.

The function http_location_copy() copies a header structure hdr. If the header structure hdr contains a reference (hdr->h_next) to a list of headers, all the headers in that list are copied, too. The function uses given memory home to allocate all the memory areas used to copy the header structure hdr.

Parameters:

	home	memory home used to allocate new structure
	hdr	pointer to the header structure to be duplicated

When copying, only the header structure and parameter lists attached to it are duplicated. The new header structure retains all the references to the strings within the old header, including the encoding of the old header, if present.

Example

   location = http_location_copy(home, http->http_location);

Returns:

The function http_location_copy() returns a pointer to newly copied header structure, or NULL upon an error.

http_location_t * http_location_dup	(	su_home_t *	home,
		http_location_t const *	hdr
	)			[inline]

Duplicate (deep copy) http_location_t.

The function http_location_dup() duplicates a header structure hdr. If the header structure hdr contains a reference (hdr->x_next) to a list of headers, all the headers in the list are duplicated, too.

Parameters:

	home	memory home used to allocate new structure
	hdr	header structure to be duplicated

When duplicating, all parameter lists and non-constant strings attached to the header are copied, too. The function uses given memory home to allocate all the memory areas used to copy the header.

Example

   location = http_location_dup(home, http->http_location);

Returns:

The function http_location_dup() returns a pointer to the newly duplicated http_location_t header structure, or NULL upon an error.

http_location_t * http_location_format	(	su_home_t *	home,
		char const *	fmt,
			...
	)			[inline]

Make a Location header from formatting result.

The function http_location_format() makes a new Location header object using formatting result as its value. The function first prints the arguments according to the format fmt specified. Then it allocates a new header structure, and uses the formatting result as the header value.

Parameters:

	home	memory home used to allocate new header structure.
	fmt	string used as a printf()-style format
	...	argument list for format

Note:

This function is usually implemented as a macro calling msg_header_format().

Returns:

The function http_location_format() returns a pointer to newly makes header structure, or NULL upon an error.

http_location_t* http_location_init

(

http_location_t

x[1]

)

[inline]

Initialize a structure http_location_t.

An http_location_t structure can be initialized with the http_location_init() function/macro. For instance,

  http_location_t http_location;

  http_location_init(&http_location);

http_location_t * http_location_make	(	su_home_t *	home,
		char const *	s
	)			[inline]

Make a header structure http_location_t.

The function http_location_make() makes a new http_location_t header structure. It allocates a new header structure, and decodes the string s as the value of the structure.

Parameters:

	home	memory home used to allocate new header structure.
	s	string to be decoded as value of the new header structure

Note:

This function is usually implemented as a macro calling http_header_make().

Returns:

The function http_location_make() returns a pointer to newly maked http_location_t header structure, or NULL upon an error.

---

Variable Documentation

msg_hclass_t http_location_class[]

Header class for HTTP Location header.

The header class http_location_class defines how a HTTP Location header is parsed and printed. It also contains methods used by HTTP parser and other functions to manipulate the http_location_t header structure.