The Warning response-header field is used to carry additional information about the status of a response.
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The Warning response-header field is used to carry additional information about the status of a response.
Its syntax is defined in [S20.43] as follows:
Warning = "Warning" HCOLON warning-value *(COMMA warning-value)
warning-value = warn-code SP warn-agent SP warn-text
warn-code = 3DIGIT
warn-agent = hostport / pseudonym
; the name or pseudonym of the server adding
; the Warning header, for use in debugging
warn-text = quoted-string
pseudonym = token
◆ MSG_WARNING_INIT
#define MSG_WARNING_INIT |
( |
| ) |
|
Initializer for an msg_warning_t structure.
A static msg_warning_t structure must be initialized with the MSG_WARNING_INIT() macro. For instance,
#define MSG_WARNING_INIT()
Initializer for an msg_warning_t structure.
Definition: msg_mime_protos.h:3852
Structure for Warning header.
Definition: msg_mime.h:145
◆ msg_warning_t
The structure msg_warning_t contains representation of an Warning header.
The msg_warning_t is defined as follows:
{
struct msg_warning_s msg_warning_t
The structure msg_warning_t contains representation of an Warning header.
Definition: msg_mime.h:71
Common part of the header objects (or message fragments).
Definition: msg_types.h:111
msg_common_t w_common[1]
Common fragment info.
Definition: msg_mime.h:146
char const * w_text
Warning text.
Definition: msg_mime.h:151
char const * w_port
Port number.
Definition: msg_mime.h:150
char const * w_host
Hostname or pseudonym.
Definition: msg_mime.h:149
unsigned w_code
Warning code.
Definition: msg_mime.h:148
msg_warning_t * w_next
Link to next Warning header.
Definition: msg_mime.h:147
◆ anonymous enum
Enumerator |
---|
msg_warning_hash | Hash of Warning header.
|
◆ msg_is_warning()
Test if header object is an instance of msg_warning_t.
The function msg_is_warning() returns true (nonzero) if the header class is an instance of Warning header object and false (zero) otherwise.
- Parameters
-
header | pointer to the header structure to be tested |
- Returns
- The function msg_is_warning() returns true (nonzero) if the header object is an instance of header Warning header and false (zero) otherwise.
◆ msg_warning_copy()
Copy an msg_warning_t header structure.
The function msg_warning_copy() copies a header structure header. If the header structure header contains a reference (header->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 header.
- Parameters
-
home | memory home used to allocate new structure |
header | 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
msg_warning_t * msg_warning_copy(su_home_t *home, msg_warning_t const *header)
Copy an msg_warning_t header structure.
Definition: msg_mime_protos.h:3981
- Returns
- The function msg_warning_copy() returns a pointer to newly copied header structure, or NULL upon an error.
◆ msg_warning_dup()
Duplicate (deep copy) msg_warning_t.
The function msg_warning_dup() duplicates a header structure header. If the header structure header contains a reference (header->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 |
header | 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
msg_warning_t * msg_warning_dup(su_home_t *home, msg_warning_t const *header)
Duplicate (deep copy) msg_warning_t.
Definition: msg_mime_protos.h:3936
- Returns
- The function msg_warning_dup() returns a pointer to the newly duplicated msg_warning_t header structure, or NULL upon an error.
◆ msg_warning_format()
Make a Warning header from formatting result.
The function msg_warning_format() makes a new Warning header object using snprintf-formatted 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 may be implemented as a macro calling msg_header_format().
- Returns
- The function msg_warning_format() returns a pointer to newly makes header structure, or NULL upon an error.
◆ msg_warning_init()
Initialize an msg_warning_t structure.
An msg_warning_t structure can be initialized with the msg_warning_init() function/macro. For instance,
msg_warning_t * msg_warning_init(msg_warning_t x[1])
Initialize an msg_warning_t structure.
Definition: msg_mime_protos.h:3869
- Parameters
-
◆ msg_warning_make()
Make a header structure msg_warning_t.
The function msg_warning_make() makes a new msg_warning_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 may be implemented as a macro calling msg_header_make().
- Returns
- The function msg_warning_make() returns a pointer to newly maked msg_warning_t header structure, or NULL upon an error.
◆ msg_warning_class
Header class for Warning header.
The header class msg_warning_class defines how a Warning header header is parsed and printed. It also contains methods used by message parser and other functions to manipulate the msg_warning_t header structure.