<s>
The	O
Asynchronous	B-Language
Server	I-Language
Gateway	I-Language
Interface	I-Language
(	O
ASGI	B-Language
)	O
is	O
a	O
calling	O
convention	O
for	O
web	B-Application
servers	I-Application
to	O
forward	O
requests	O
to	O
asynchronous-capable	O
Python	B-Language
programming	I-Language
language	I-Language
frameworks	B-Application
,	O
and	O
applications	O
.	O
</s>
<s>
It	O
is	O
built	O
as	O
a	O
successor	O
to	O
the	O
Web	B-Language
Server	I-Language
Gateway	I-Language
Interface	I-Language
(	O
WSGI	B-Language
)	O
.	O
</s>
<s>
Where	O
WSGI	B-Language
provided	O
a	O
standard	O
for	O
synchronous	O
Python	B-Language
application	O
,	O
ASGI	B-Language
provides	O
one	O
for	O
both	O
asynchronous	B-Operating_System
and	O
synchronous	O
applications	O
,	O
with	O
a	O
WSGI	B-Language
backwards-compatibility	O
implementation	O
and	O
multiple	O
servers	O
and	O
application	O
frameworks	B-Application
.	O
</s>
<s>
Below	O
listed	O
some	O
complete	O
or	O
upcoming	O
implementations	O
of	O
Asynchronous	B-Language
Server	I-Language
Gateway	I-Language
Interface	I-Language
-	O
web	B-Application
servers	I-Application
and	O
frameworks	B-Application
.	O
</s>
<s>
is	O
a	O
Hypertext	B-Protocol
Transfer	I-Protocol
Protocol	I-Protocol
,	O
HTTP2	B-Protocol
and	O
WebSocket	B-Protocol
protocol	O
server	B-Application
for	O
ASGI	B-Language
and	O
ASGI-HTTP	O
,	O
developed	O
to	O
power	O
Django	B-Language
(	O
web	B-Application
framework	I-Application
)	O
Channels	O
.	O
</s>
<s>
It	O
supports	O
automatic	O
negotiation	O
of	O
protocols	O
;	O
there	O
's	O
no	O
need	O
for	O
URL	O
prefixing	O
to	O
determine	O
WebSocket	B-Protocol
endpoints	O
versus	O
HTTP	B-Protocol
endpoints	O
.	O
</s>
<s>
is	O
an	O
ASGI	B-Language
web	B-Application
server	I-Application
implementation	O
for	O
Python	B-Language
(	O
programming	O
language	O
)	O
.	O
</s>
<s>
Uvicorn	O
currently	O
supports	O
HTTP/1.1	B-Protocol
and	O
WebSockets	B-Protocol
.	O
</s>
<s>
is	O
an	O
ASGI	B-Language
and	O
WSGI	B-Language
web	B-Application
server	I-Application
based	O
on	O
the	O
sans-io	O
hyper	O
,	O
h11	O
,	O
h2	O
,	O
and	O
wsproto	O
libraries	O
and	O
inspired	O
by	O
Gunicorn	B-Application
.	O
</s>
<s>
Hypercorn	O
supports	O
HTTP/1	B-Protocol
,	O
HTTP/2	B-Protocol
,	O
WebSockets	B-Protocol
(	O
over	O
HTTP/1	B-Protocol
and	O
HTTP/2	B-Protocol
)	O
,	O
ASGI	B-Language
,	O
and	O
WSGI	B-Language
specifications	O
.	O
</s>
<s>
ASGI	B-Language
is	O
also	O
designed	O
to	O
be	O
a	O
superset	O
of	O
WSGI	B-Language
,	O
and	O
there	O
’s	O
a	O
defined	O
way	O
of	O
translating	O
between	O
the	O
two	O
,	O
allowing	O
WSGI	B-Language
applications	O
to	O
be	O
run	O
inside	O
ASGI	B-Language
servers	O
through	O
a	O
translation	O
wrapper	O
(	O
provided	O
in	O
the	O
asgiref	O
library	O
)	O
.	O
</s>
<s>
A	O
threadpool	O
can	O
be	O
used	O
to	O
run	O
the	O
synchronous	O
WSGI	B-Language
applications	O
away	O
from	O
the	O
async	O
event	O
loop	O
.	O
</s>
