Specifying the `async_mode` parameter seems to have been a workaround for
packaging on Windows and macOS.  If not given, flask_socketio.SocketIO will
probe for an available asynchronous model, e.g. `eventlet`, and otherwise gets
stuck if `gevent-socketio` is not available.

c.f. https://github.com/onionshare/onionshare/commit/ec7fa4ef16c9e1ba6028ee927c23f76c399a17a6
and  https://github.com/onionshare/onionshare/issues/1510

diff --git a/cli/onionshare_cli/web/web.py b/cli/onionshare_cli/web/web.py
index 64844b5..7e1b095 100644
--- a/cli/onionshare_cli/web/web.py
+++ b/cli/onionshare_cli/web/web.py
@@ -164,10 +164,10 @@ class Web:
         elif self.mode == "chat":
             if self.common.verbose:
                 self.socketio = SocketIO(
-                    async_mode="gevent", logger=True, engineio_logger=True
+                    logger=True, engineio_logger=True
                 )
             else:
-                self.socketio = SocketIO(async_mode="gevent")
+                self.socketio = SocketIO()
             self.socketio.init_app(self.app)
             self.chat_mode = ChatModeWeb(self.common, self)
 
ref='/guix/'>summary</a><a href='/guix/refs/?id=cbb019eef681eb39bcf35da548d3f1b67c14c73b'>refs</a><a class='active' href='/guix/log/tests/guix-shell-export-manifest.sh?showmsg=1'>log</a><a href='/guix/tree/tests/guix-shell-export-manifest.sh?id=cbb019eef681eb39bcf35da548d3f1b67c14c73b'>tree</a><a href='/guix/commit/tests/guix-shell-export-manifest.sh?id=cbb019eef681eb39bcf35da548d3f1b67c14c73b'>commit</a><a href='/guix/diff/tests/guix-shell-export-manifest.sh?id=cbb019eef681eb39bcf35da548d3f1b67c14c73b'>diff</a></td><td class='form'><form class='right' method='get' action='/guix/log/tests/guix-shell-export-manifest.sh'>
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<div class='path'>path: <a href='/guix/log/?id=cbb019eef681eb39bcf35da548d3f1b67c14c73b&amp;showmsg=1'>root</a>/<a href='/guix/log/tests?id=cbb019eef681eb39bcf35da548d3f1b67c14c73b&amp;showmsg=1'>tests</a>/<a href='/guix/log/tests/guix-shell-export-manifest.sh?id=cbb019eef681eb39bcf35da548d3f1b67c14c73b&amp;showmsg=1'>guix-shell-export-manifest.sh</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/guix-shell-export-manifest.sh?id=cbb019eef681eb39bcf35da548d3f1b67c14c73b'>Collapse</a>)</th><th class='left'>Author</th></tr>
<tr class='logheader'><td><span title='2022-06-16 23:57:40 +0200'>2022-06-16</span></td><td class='logsubject'><a href='/guix/commit/tests/guix-shell-export-manifest.sh?id=925a57c5d04553ff6c514867348e7d3c5c22ca66'>shell: Fix '--export-manifest' for cached profiles and when '-p' is used.</a></td><td>Ludovic Courtès</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
Fixes &lt;https://issues.guix.gnu.org/55521&gt;.

* guix/scripts/shell.scm (export-manifest): When computing 'manifest',
honor the 'profile key.
* tests/guix-shell-export-manifest.sh: Add test.


</td></tr>
<tr class='logheader'><td><span title='2022-06-01 22:22:19 +0200'>2022-06-01</span></td><td class='logsubject'><a href='/guix/commit/tests/guix-shell-export-manifest.sh?id=2acc83daa5a3dd1b4ed3f8c32ecadf1313e6fd18'>shell: '--export-manifest -D x -D y' generates a valid manifest.</a></td><td>Ludovic Courtès</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* guix/scripts/shell.scm (manifest-&gt;code*): Add missing 'list' in
generated 'concatenate-manifests' call.
* tests/guix-shell-export-manifest.sh: Add test.


</td></tr>
<tr class='logheader'><td><span title='2022-04-08 18:14:35 +0200'>2022-04-08</span></td><td class='logsubject'><a href='/guix/commit/tests/guix-shell-export-manifest.sh?id=20691c70cf2c5a61af7f906b65d57a524ecfc4f3'>tests: 'guix shell --export-manifest' test no longer needs networking.</a></td><td>Ludovic Courtès</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* tests/guix-shell-export-manifest.sh: Use '--with-input' rather than
'--with-latest' as the latter would crash in the absence of network
access.


</td></tr>
<tr class='logheader'><td><span title='2022-04-04 22:58:04 +0200'>2022-04-04</span></td><td class='logsubject'><a href='/guix/commit/tests/guix-shell-export-manifest.sh?id=c42b7baf13c7633b4512e94da7445299c57b247d'>shell: Add '--export-manifest'.</a></td><td>Ludovic Courtès</td></tr>
<tr class='nohover-highlight'><td/><td colspan='3' class='logmsg'>
* guix/scripts/shell.scm (show-help, %options): Add '--export-manifest'.
(manifest-entry-version-prefix, manifest-&gt;code*)
(export-manifest): New procedures.
(guix-shell): Honor '--export-manifest'.
* tests/guix-shell-export-manifest.sh: New file.
* Makefile.am (SH_TESTS): Add it.
* doc/guix.texi (Invoking guix shell): Document '--export-manifest'.
(Invoking guix environment): Link to it.
(Invoking guix pack): Likewise.


</td></tr>