<s>
A	O
well-known	B-Protocol
URI	I-Protocol
is	O
a	O
Uniform	B-Protocol
Resource	I-Protocol
Identifier	I-Protocol
for	O
URL	O
path	O
prefixes	O
that	O
start	O
with	O
/.well-known/	O
.	O
</s>
<s>
They	O
are	O
implemented	O
in	O
webservers	B-Application
so	O
that	O
requests	O
to	O
the	O
servers	O
for	O
well-known	O
services	O
or	O
information	O
are	O
available	O
at	O
URLs	O
consistent	O
well-known	O
locations	O
across	O
servers	O
.	O
</s>
<s>
Well-known	B-Protocol
URIs	I-Protocol
are	O
Uniform	B-Protocol
Resource	I-Protocol
Identifiers	I-Protocol
defined	O
by	O
the	O
IETF	O
in	O
RFC	O
8615	O
.	O
</s>
<s>
They	O
are	O
URL	O
path	O
prefixes	O
that	O
start	O
with	O
/.well-known/	O
.	O
</s>
<s>
The	O
URIs	B-Protocol
implemented	O
in	O
webservers	B-Application
so	O
that	O
requests	O
to	O
the	O
servers	O
for	O
well-known	O
services	O
or	O
information	O
are	O
available	O
at	O
URLs	O
consistent	O
well-known	O
locations	O
across	O
servers	O
.	O
</s>
<s>
The	O
IETF	O
has	O
defined	O
a	O
simple	O
way	O
for	O
web	B-Application
servers	I-Application
to	O
hold	O
metadata	O
that	O
any	O
user	B-Protocol
agent	I-Protocol
(	O
e.g.	O
,	O
web	B-Application
browser	I-Application
)	O
can	O
request	O
.	O
</s>
<s>
The	O
metadata	O
is	O
useful	O
for	O
various	O
tasks	O
,	O
including	O
directing	O
a	O
web	O
user	O
to	O
use	O
a	O
mobile	B-Application
app	I-Application
instead	O
of	O
the	O
website	O
or	O
indicating	O
the	O
different	O
ways	O
that	O
the	O
site	O
can	O
be	O
secured	O
.	O
</s>
<s>
The	O
well-known	O
locations	O
are	O
used	O
by	O
web	B-Application
servers	I-Application
to	O
share	O
metadata	O
with	O
user	B-Protocol
agents	I-Protocol
;	O
sometimes	O
these	O
are	O
files	O
and	O
sometimes	O
these	O
are	O
requests	O
for	O
information	O
from	O
the	O
web	B-Application
server	I-Application
software	O
itself	O
.	O
</s>
<s>
The	O
path	O
well-known	B-Protocol
URI	I-Protocol
begins	O
with	O
the	O
characters	O
/.well-known/	O
,	O
and	O
whose	O
scheme	O
is	O
"	O
HTTP	O
"	O
,	O
"	O
HTTPS	O
"	O
,	O
or	O
another	O
scheme	O
that	O
has	O
explicitly	O
been	O
specified	O
to	O
use	O
well-known	B-Protocol
URIs	I-Protocol
.	O
</s>
<s>
As	O
an	O
example	O
,	O
if	O
an	O
application	O
hosts	O
the	O
service	O
"	O
example	O
"	O
,	O
the	O
corresponding	O
well-known	B-Protocol
URIs	I-Protocol
on	O
https://www.example.com/	O
would	O
start	O
with	O
https://www.example.com/.well-known/example	O
.	O
</s>
<s>
Specifications	O
that	O
need	O
to	O
define	O
a	O
resource	O
for	O
such	O
site-wide	O
metadata	O
can	O
register	O
their	O
use	O
with	O
Internet	O
Assigned	O
Numbers	O
Authority	O
(	O
IANA	O
)	O
to	O
avoid	O
collisions	O
and	O
minimize	O
impingement	O
upon	O
sites	O
 '	O
URI	B-Protocol
space	O
.	O
</s>
<s>
The	O
list	O
below	O
describes	O
known	O
standards	O
for	O
.well-known	B-Protocol
services	O
that	O
a	O
web	B-Application
server	I-Application
can	O
implement	O
.	O
</s>
<s>
URI	B-Protocol
suffix	O
Description	O
Reference	O
Date	O
of	O
IANA	O
registrationacme-challengeAutomated	O
Certificate	O
Management	O
Environment	O
(	O
ACME	B-Protocol
)	O
2019-03-01ai-plugin.jsonManifest	O
for	O
a	O
ChatGPT	B-General_Concept
plugin.apple-app-site-associationAn	O
Apple	O
service	O
that	O
enables	O
secure	O
data	O
exchange	O
between	O
iOS	O
and	O
a	O
website.apple-developer-merchantid-domain-associationApple	O
PayashraeBACnet	O
-	O
A	O
Data	O
Communication	O
Protocol	O
for	O
Building	O
Automation	O
and	O
Control	O
Networks2016-01-22assetlinks.jsonAssetLinks	O
protocol	O
used	O
to	O
identify	O
one	O
or	O
more	O
digital	O
assets	O
(	O
such	O
as	O
web	O
sites	O
or	O
mobile	B-Application
apps	I-Application
)	O
that	O
are	O
related	O
to	O
the	O
hosting	O
web	O
site	O
in	O
some	O
fashion.2015-09-28autoconfig/mailMozilla	O
Thunderbird	B-Application
mail	O
autoconfiguration	O
servicebrowseridMozilla	O
PersonacaldavLocating	O
Services	O
for	O
Calendaring	O
Extensions	O
to	O
WebDAV	O
(	O
CalDAV	B-Protocol
)	O
and	O
vCard	O
Extensions	O
to	O
WebDAV	O
(	O
CardDAV	B-Protocol
)	O
carddavLocating	O
Services	O
for	O
Calendaring	O
Extensions	O
to	O
WebDAV	O
(	O
CalDAV	B-Protocol
)	O
and	O
vCard	O
Extensions	O
to	O
WebDAV	O
(	O
CardDAV	B-Protocol
)	O
change-passwordHelps	O
password	O
managers	O
find	O
the	O
URL	O
for	O
the	O
change	O
password	O
section.coapCoAP	O
(	O
Constrained	B-Device
Application	I-Device
Protocol	I-Device
)	O
over	O
TCP	O
,	O
TLS	O
,	O
and	O
WebSockets2017-12-22com.apple.remotemanagementApple	O
account-based	O
user	O
enrollment	O
for	O
Mobile	O
device	O
managementcoreConstrained	O
RESTful	O
Environments	O
(	O
CoRE	O
)	O
Link	O
FormatcsvmCSV	O
metadata	O
,	O
Model	O
for	O
Tabular	O
Data	O
and	O
Metadata	O
on	O
the	O
Web2015-09-28datLinks	O
domain	O
to	O
Dat	O
identifier	O
,	O
used	O
by	O
Beaker	O
web	O
browser.dntSite-wide	O
tracking	O
status	O
resource2015-08-19dnt-policy.txtA	O
privacy-friendly	O
Do	O
Not	O
Track	O
(	O
DNT	O
)	O
Policy2015-08-19estEnrollment	O
over	O
Secure	O
Transport	O
(	O
EST	O
)	O
2013-08-16genidThe	O
Resource	O
Description	O
Framework	O
(	O
RDF	O
)	O
Skolem	O
IRIs2012-11-15gpcGlobal	O
Privacy	O
Control	O
(	O
GPC	O
)	O
hobaHTTP	O
Origin-Bound	O
Authentication	O
(	O
HOBA	O
)	O
2015-01-20host-metaWeb	O
Host	O
Metadatahost-meta.jsonWeb	O
Host	O
Metadatahttp-opportunisticOpportunistic	O
Security	O
for	O
HTTP/22017	O
-03-20keybase.txtUsed	O
by	O
the	O
Keybase	B-Application
project	O
to	O
identify	O
a	O
proof	O
that	O
one	O
or	O
more	O
people	O
whose	O
public	O
keys	O
may	O
be	O
retrieved	O
using	O
the	O
Keybase	B-Application
service	O
have	O
administrative	O
control	O
over	O
the	O
origin	O
server	O
from	O
which	O
it	O
is	O
retrieved.2014-04-08matrixProvides	O
discovery	O
for	O
both	O
client	O
and	O
server	O
APIs	O
to	O
the	O
Matrix	B-Protocol
federated	O
protocol.mercureDiscovery	O
of	O
Mercure	O
hubs	O
.	O
</s>
<s>
Mercure	O
is	O
a	O
protocol	O
enabling	O
the	O
pushing	O
of	O
data	O
updates	O
to	O
web	B-Application
browsers	I-Application
and	O
other	O
HTTP	B-Application
clients	I-Application
in	O
a	O
fast	O
,	O
reliable	O
and	O
battery-efficient	O
way.mta-sts.txtSMTP	O
MTA	O
Strict	O
Transport	O
Security	O
Policy2018-06-21niNaming	O
Things	O
with	O
HashesnodeinfoMetadata	O
for	O
federated	O
social	O
networking	O
serversopenid-configurationOpenID	O
Connect2013-08-27openorgOrganisation	O
Profile	O
Document2015-05-29openpgpkeyOpenPGP	O
Web	O
Key	O
Servicepki-validationCA/Browser	O
Forum	O
’s	O
Baseline	O
Requirements	O
Certificate	O
Policy	O
for	O
the	O
Issuance	O
and	O
Management	O
of	O
Publicly-Trusted	O
Certificates2017-02-06poshPKIX	O
over	O
Secure	O
HTTP	O
(	O
POSH	O
)	O
2015-09-20pubvendors.jsonThe	O
IAB	O
pubvendors.json	O
tech	O
spec	O
,	O
which	O
provide	O
a	O
standard	O
for	O
publishers	O
to	O
publicly	O
declare	O
the	O
vendors	O
that	O
they	O
work	O
with	O
,	O
and	O
their	O
respective	O
data	O
rights/configuration.2020	O
-09-07reload-configREsource	O
LOcation	O
And	O
Discovery	O
(	O
RELOAD	O
)	O
Base	O
Protocolrepute-templateA	O
Reputation	O
Query	O
Protocol2013-09-30resourcesyncResourceSync	O
Framework	O
Specification2017-05-26security.txtStandard	O
to	O
help	O
organizations	O
define	O
the	O
process	O
for	O
security	O
researchers	O
to	O
disclose	O
security	O
vulnerabilities2018-08-20stun-keySession	O
Traversal	O
Utilities	O
for	O
NAT	O
(	O
STUN	B-Protocol
)	O
Extension	O
for	O
Third-Party	O
Authorization2015-06-12timeTime	O
over	O
HTTPS	O
specification2015-12-09timezoneTime	O
Zone	O
Data	O
Distribution	O
Service2015-08-03uma2-configurationUser-Managed	O
Access	O
(	O
UMA	O
)	O
2.0	O
grant	O
for	O
OAuth	O
2.0	O
authorization2017-06-20voidDescribing	O
Linked	O
Datasets	O
with	O
the	O
VoID	B-Application
Vocabulary2011-05-11webfingerWebFinger2013-03-15	O
,	O
2013-09-06xrp-ledger.tomlXRP	O
ledger	O
node	O
&	O
account	O
information	O
.	O
</s>
