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CACHE-CONTROL: max-age=1800 in M-SEARCH response 

to be compliant with UPnP UDA 1.0, 1.1 and 2.0

fixes #698

UDA 1.0 1.2.3 Discovery: Search: Response (p21) :
CACHE-CONTROL
Required. Must have max-age directive that specifies number of seconds
the advertisement is valid. After this duration, control points should
assume the device (or service) is no longer available. Should be greater
than or equal to 1800 seconds (30 minutes), although exceptions are defined
in the text above. Specified by UPnP vendor. Integer.

UDA 1.1 1.3.3 Search response (p34) :
CACHE-CONTROL
REQUIRED. Field value MUST have the max-age directive (“max-age=”) followed
by an integer that specifies the number of seconds the advertisement
is valid. After this duration, control points SHOULD assume the device
(or service) is no longer available; as long as a control point has
received at least one advertisement that is still valid from a root
device, any of its embedded devices or any of its services, then the
control point can assume that all are available. The number of seconds
SHOULD be greater than or equal to 1800 seconds (30 minutes), although
exceptions are defined in the text above. Specified by UPnP vendor.
Other directives MUST NOT be sent and MUST be ignored when received.

UDA 2.0 1.3.3 Search response (p40) :
CACHE-CONTROL
Required. Field value shall have the max-age directive (“max-age=”) followed
by an integer that specifies the number of seconds the advertisement
is valid. After this duration, control points should assume the device
(or service) is no longer available; as long as a control point has
received at least one advertisement that is still valid from a root
device, any of its embedded devices or any of its services, then the
control point can assume that all are available. The number of seconds
should be greater than or equal to 1800 seconds (30 minutes), although
exceptions are defined in the text above. Specified by UPnP vendor.
Other directives shall not be sent and shall be ignored when received.
This commit is contained in:
Thomas Bernard 2024-01-15 00:15:32 +01:00
parent ac693ff933
commit 53d4cdd2da
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1 changed files with 3 additions and 4 deletions
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7
miniupnpd/minissdp.c
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@ -524,11 +524,10 @@ SendSSDPResponse(int s, const struct sockaddr * addr,
* uppercase is recommended.
* DATE: is recommended
* SERVER: OS/ver UPnP/1.0 miniupnpd/1.0
* - check what to put in the 'Cache-Control' header
*
* have a look at the document "UPnP Device Architecture v1.1 */
* CACHE-CONTROL: Should be greater than or equal to 1800 seconds
*/
l = snprintf(buf, sizeof(buf), "HTTP/1.1 200 OK\r\n"
"CACHE-CONTROL: max-age=120\r\n"
"CACHE-CONTROL: max-age=1800\r\n"
#ifdef ENABLE_HTTP_DATE
"DATE: %s\r\n"
#endif