When the bot receives a 502 error, it's reported to be a Server Hangup, when it doesn't the response size of the server is 0 bytes, empty.
Here are a bunch of requests that failed from the failure log.
Date/Time: Tue, 26 Jan 2021 14:21:34 +0000
Method: GET
URL: https://en.wikipedia.org/w/api.php
Parameters: Array
(
[action] => query
[prop] => revisions
[titles] => Wikipedia:Requests for adminship
[rvprop] => timestamp|ids|user|comment|content
[rawcontinue] => 1
[rvdir] => older
[rvlimit] => 1
[format] => php
[servedby] =>
[requestid] => 756061289
)
Raw Data: <!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<title>Wikimedia Error</title>
<style>
* { margin: 0; padding: 0; }
body { background: #fff; font: 15px/1.6 sans-serif; color: #333; }
.content { margin: 7% auto 0; padding: 2em 1em 1em; max-width: 640px; }
.footer { clear: both; margin-top: 14%; border-top: 1px solid #e5e5e5; background: #f9f9f9; padding: 2em 0; font-size: 0.8em; text-align: center; }
img { float: left; margin: 0 2em 2em 0; }
a img { border: 0; }
h1 { margin-top: 1em; font-size: 1.2em; }
.content-text { overflow: hidden; overflow-wrap: break-word; word-wrap: break-word; -webkit-hyphens: auto; -moz-hyphens: auto; -ms-hyphens: auto; hyphens: auto; }
p { margin: 0.7em 0 1em 0; }
a { color: #0645ad; text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: sans-serif; }
.text-muted { color: #777; }
</style>
<div class="content" role="main">
<a href="https://www.wikimedia.org"><img src="https://www.wikimedia.org/static/images/wmf-logo.png" srcset="https://www.wikimedia.org/static/images/wmf-logo-2x.png 2x" alt="Wikimedia" width="135" height="101">
</a>
<h1>Error</h1>
<div class="content-text">
<p>Our servers are currently under maintenance or experiencing a technical problem.
Please <a href="" title="Reload this page" onclick="window.location.reload(false); return false">try again</a> in a few minutes.</p>
<p>See the error message at the bottom of this page for more information.</p>
</div>
</div>
<div class="footer"><p>If you report this error to the Wikimedia System Administrators, please include the details below.</p><p class='text-muted'><code>Request from 172.16.2.21 via cp1089.eqiad.wmnet, ATS/8.0.8<br>Error: 502, Server Hangup at 2021-01-26 14:21:34 GMT</code></p></div>
</html>
UNSERIALIZATION FAILED
Date/Time: Tue, 26 Jan 2021 14:21:34 +0000
Method: GET
URL: https://en.wikipedia.org/w/api.php
Parameters: Array
(
[action] => query
[prop] => revisions
[titles] => List of Foster's Home for Imaginary Friends episodes
[rvprop] => timestamp|ids|user|comment|content
[rawcontinue] => 1
[rvdir] => older
[rvlimit] => 1
[format] => php
[servedby] =>
[requestid] => 1867423561
)
Raw Data: <!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<title>Wikimedia Error</title>
<style>
* { margin: 0; padding: 0; }
body { background: #fff; font: 15px/1.6 sans-serif; color: #333; }
.content { margin: 7% auto 0; padding: 2em 1em 1em; max-width: 640px; }
.footer { clear: both; margin-top: 14%; border-top: 1px solid #e5e5e5; background: #f9f9f9; padding: 2em 0; font-size: 0.8em; text-align: center; }
img { float: left; margin: 0 2em 2em 0; }
a img { border: 0; }
h1 { margin-top: 1em; font-size: 1.2em; }
.content-text { overflow: hidden; overflow-wrap: break-word; word-wrap: break-word; -webkit-hyphens: auto; -moz-hyphens: auto; -ms-hyphens: auto; hyphens: auto; }
p { margin: 0.7em 0 1em 0; }
a { color: #0645ad; text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: sans-serif; }
.text-muted { color: #777; }
</style>
<div class="content" role="main">
<a href="https://www.wikimedia.org"><img src="https://www.wikimedia.org/static/images/wmf-logo.png" srcset="https://www.wikimedia.org/static/images/wmf-logo-2x.png 2x" alt="Wikimedia" width="135" height="101">
</a>
<h1>Error</h1>
<div class="content-text">
<p>Our servers are currently under maintenance or experiencing a technical problem.
Please <a href="" title="Reload this page" onclick="window.location.reload(false); return false">try again</a> in a few minutes.</p>
<p>See the error message at the bottom of this page for more information.</p>
</div>
</div>
<div class="footer"><p>If you report this error to the Wikimedia System Administrators, please include the details below.</p><p class='text-muted'><code>Request from 172.16.2.21 via cp1087.eqiad.wmnet, ATS/8.0.8<br>Error: 502, Server Hangup at 2021-01-26 14:21:34 GMT</code></p></div>
</html>
UNSERIALIZATION FAILED
Date/Time: Tue, 26 Jan 2021 14:21:34 +0000
Method: GET
URL: https://en.wikipedia.org/w/api.php
Parameters: Array
(
[action] => query
[prop] => revisions
[titles] => List of Foster's Home for Imaginary Friends episodes
[rvprop] => timestamp|ids|user|comment|content
[rawcontinue] => 1
[rvdir] => older
[rvlimit] => 1
[format] => php
[servedby] =>
[requestid] => 1867423561
)
Raw Data: <!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<title>Wikimedia Error</title>
<style>
* { margin: 0; padding: 0; }
body { background: #fff; font: 15px/1.6 sans-serif; color: #333; }
.content { margin: 7% auto 0; padding: 2em 1em 1em; max-width: 640px; }
.footer { clear: both; margin-top: 14%; border-top: 1px solid #e5e5e5; background: #f9f9f9; padding: 2em 0; font-size: 0.8em; text-align: center; }
img { float: left; margin: 0 2em 2em 0; }
a img { border: 0; }
h1 { margin-top: 1em; font-size: 1.2em; }
.content-text { overflow: hidden; overflow-wrap: break-word; word-wrap: break-word; -webkit-hyphens: auto; -moz-hyphens: auto; -ms-hyphens: auto; hyphens: auto; }
p { margin: 0.7em 0 1em 0; }
a { color: #0645ad; text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: sans-serif; }
.text-muted { color: #777; }
</style>
<div class="content" role="main">
<a href="https://www.wikimedia.org"><img src="https://www.wikimedia.org/static/images/wmf-logo.png" srcset="https://www.wikimedia.org/static/images/wmf-logo-2x.png 2x" alt="Wikimedia" width="135" height="101">
</a>
<h1>Error</h1>
<div class="content-text">
<p>Our servers are currently under maintenance or experiencing a technical problem.
Please <a href="" title="Reload this page" onclick="window.location.reload(false); return false">try again</a> in a few minutes.</p>
<p>See the error message at the bottom of this page for more information.</p>
</div>
</div>
<div class="footer"><p>If you report this error to the Wikimedia System Administrators, please include the details below.</p><p class='text-muted'><code>Request from 172.16.2.21 via cp1087.eqiad.wmnet, ATS/8.0.8<br>Error: 502, Server Hangup at 2021-01-26 14:21:34 GMT</code></p></div>
</html>
UNSERIALIZATION FAILED
Date/Time: Tue, 26 Jan 2021 14:21:34 +0000
Method: GET
URL: https://en.wikipedia.org/w/api.php
Parameters: Array
(
[action] => query
[prop] => revisions
[titles] => List of Foster's Home for Imaginary Friends episodes
[rvprop] => timestamp|ids|user|comment|content
[rawcontinue] => 1
[rvdir] => older
[rvlimit] => 1
[format] => php
[servedby] =>
[requestid] => 1867423561
)
Raw Data: <!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<title>Wikimedia Error</title>
<style>
* { margin: 0; padding: 0; }
body { background: #fff; font: 15px/1.6 sans-serif; color: #333; }
.content { margin: 7% auto 0; padding: 2em 1em 1em; max-width: 640px; }
.footer { clear: both; margin-top: 14%; border-top: 1px solid #e5e5e5; background: #f9f9f9; padding: 2em 0; font-size: 0.8em; text-align: center; }
img { float: left; margin: 0 2em 2em 0; }
a img { border: 0; }
h1 { margin-top: 1em; font-size: 1.2em; }
.content-text { overflow: hidden; overflow-wrap: break-word; word-wrap: break-word; -webkit-hyphens: auto; -moz-hyphens: auto; -ms-hyphens: auto; hyphens: auto; }
p { margin: 0.7em 0 1em 0; }
a { color: #0645ad; text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: sans-serif; }
.text-muted { color: #777; }
</style>
<div class="content" role="main">
<a href="https://www.wikimedia.org"><img src="https://www.wikimedia.org/static/images/wmf-logo.png" srcset="https://www.wikimedia.org/static/images/wmf-logo-2x.png 2x" alt="Wikimedia" width="135" height="101">
</a>
<h1>Error</h1>
<div class="content-text">
<p>Our servers are currently under maintenance or experiencing a technical problem.
Please <a href="" title="Reload this page" onclick="window.location.reload(false); return false">try again</a> in a few minutes.</p>
<p>See the error message at the bottom of this page for more information.</p>
</div>
</div>
<div class="footer"><p>If you report this error to the Wikimedia System Administrators, please include the details below.</p><p class='text-muted'><code>Request from 172.16.2.21 via cp1087.eqiad.wmnet, ATS/8.0.8<br>Error: 502, Server Hangup at 2021-01-26 14:21:34 GMT</code></p></div>
</html>
UNSERIALIZATION FAILED
Date/Time: Tue, 26 Jan 2021 14:21:34 +0000
Method: GET
URL: https://en.wikipedia.org/w/api.php
Parameters: Array
(
[action] => query
[prop] => info
[inprop] => protection|talkid|watched|watchers|notificationtimestamp|subjectid|url|readable|preload|displaytitle
[titles] => User:Cyberbot I/Run/Meta-cont
[redirects] =>
[format] => php
[servedby] =>
[requestid] => 554762138
)
Raw Data: <!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<title>Wikimedia Error</title>
<style>
* { margin: 0; padding: 0; }
body { background: #fff; font: 15px/1.6 sans-serif; color: #333; }
.content { margin: 7% auto 0; padding: 2em 1em 1em; max-width: 640px; }
.footer { clear: both; margin-top: 14%; border-top: 1px solid #e5e5e5; background: #f9f9f9; padding: 2em 0; font-size: 0.8em; text-align: center; }
img { float: left; margin: 0 2em 2em 0; }
a img { border: 0; }
h1 { margin-top: 1em; font-size: 1.2em; }
.content-text { overflow: hidden; overflow-wrap: break-word; word-wrap: break-word; -webkit-hyphens: auto; -moz-hyphens: auto; -ms-hyphens: auto; hyphens: auto; }
p { margin: 0.7em 0 1em 0; }
a { color: #0645ad; text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: sans-serif; }
.text-muted { color: #777; }
</style>
<div class="content" role="main">
<a href="https://www.wikimedia.org"><img src="https://www.wikimedia.org/static/images/wmf-logo.png" srcset="https://www.wikimedia.org/static/images/wmf-logo-2x.png 2x" alt="Wikimedia" width="135" height="101">
</a>
<h1>Error</h1>
<div class="content-text">
<p>Our servers are currently under maintenance or experiencing a technical problem.
Please <a href="" title="Reload this page" onclick="window.location.reload(false); return false">try again</a> in a few minutes.</p>
<p>See the error message at the bottom of this page for more information.</p>
</div>
</div>
<div class="footer"><p>If you report this error to the Wikimedia System Administrators, please include the details below.</p><p class='text-muted'><code>Request from 172.16.2.21 via cp1087.eqiad.wmnet, ATS/8.0.8<br>Error: 502, Server Hangup at 2021-01-26 14:21:34 GMT</code></p></div>
</html>
UNSERIALIZATION FAILED
Date/Time: Tue, 26 Jan 2021 14:21:35 +0000
Method: GET
URL: https://en.wikipedia.org/w/api.php
Parameters: Array
(
[action] => query
[prop] => info
[inprop] => protection|talkid|watched|watchers|notificationtimestamp|subjectid|url|readable|preload|displaytitle
[titles] => Wikipedia:Changing username/Usurpations
[redirects] =>
[format] => php
[servedby] =>
[requestid] => 182313283
)
Raw Data: <!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<title>Wikimedia Error</title>
<style>
* { margin: 0; padding: 0; }
body { background: #fff; font: 15px/1.6 sans-serif; color: #333; }
.content { margin: 7% auto 0; padding: 2em 1em 1em; max-width: 640px; }
.footer { clear: both; margin-top: 14%; border-top: 1px solid #e5e5e5; background: #f9f9f9; padding: 2em 0; font-size: 0.8em; text-align: center; }
img { float: left; margin: 0 2em 2em 0; }
a img { border: 0; }
h1 { margin-top: 1em; font-size: 1.2em; }
.content-text { overflow: hidden; overflow-wrap: break-word; word-wrap: break-word; -webkit-hyphens: auto; -moz-hyphens: auto; -ms-hyphens: auto; hyphens: auto; }
p { margin: 0.7em 0 1em 0; }
a { color: #0645ad; text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: sans-serif; }
.text-muted { color: #777; }
</style>
<div class="content" role="main">
<a href="https://www.wikimedia.org"><img src="https://www.wikimedia.org/static/images/wmf-logo.png" srcset="https://www.wikimedia.org/static/images/wmf-logo-2x.png 2x" alt="Wikimedia" width="135" height="101">
</a>
<h1>Error</h1>
<div class="content-text">
<p>Our servers are currently under maintenance or experiencing a technical problem.
Please <a href="" title="Reload this page" onclick="window.location.reload(false); return false">try again</a> in a few minutes.</p>
<p>See the error message at the bottom of this page for more information.</p>
</div>
</div>
<div class="footer"><p>If you report this error to the Wikimedia System Administrators, please include the details below.</p><p class='text-muted'><code>Request from 172.16.2.21 via cp1075.eqiad.wmnet, ATS/8.0.8<br>Error: 502, Server Hangup at 2021-01-26 14:21:35 GMT</code></p></div>
</html>
UNSERIALIZATION FAILED
Date/Time: Tue, 26 Jan 2021 14:21:35 +0000
Method: GET
URL: https://en.wikipedia.org/w/api.php
Parameters: Array
(
[action] => query
[prop] => revisions
[titles] => Wikipedia:Requests for adminship
[rvprop] => timestamp|ids|user|comment|content
[rawcontinue] => 1
[rvdir] => older
[rvlimit] => 1
[format] => php
[servedby] =>
[requestid] => 1317230359
)
Raw Data: <!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<title>Wikimedia Error</title>
<style>
* { margin: 0; padding: 0; }
body { background: #fff; font: 15px/1.6 sans-serif; color: #333; }
.content { margin: 7% auto 0; padding: 2em 1em 1em; max-width: 640px; }
.footer { clear: both; margin-top: 14%; border-top: 1px solid #e5e5e5; background: #f9f9f9; padding: 2em 0; font-size: 0.8em; text-align: center; }
img { float: left; margin: 0 2em 2em 0; }
a img { border: 0; }
h1 { margin-top: 1em; font-size: 1.2em; }
.content-text { overflow: hidden; overflow-wrap: break-word; word-wrap: break-word; -webkit-hyphens: auto; -moz-hyphens: auto; -ms-hyphens: auto; hyphens: auto; }
p { margin: 0.7em 0 1em 0; }
a { color: #0645ad; text-decoration: none; }
a:hover { text-decoration: underline; }
code { font-family: sans-serif; }
.text-muted { color: #777; }
</style>
<div class="content" role="main">
<a href="https://www.wikimedia.org"><img src="https://www.wikimedia.org/static/images/wmf-logo.png" srcset="https://www.wikimedia.org/static/images/wmf-logo-2x.png 2x" alt="Wikimedia" width="135" height="101">
</a>
<h1>Error</h1>
<div class="content-text">
<p>Our servers are currently under maintenance or experiencing a technical problem.
Please <a href="" title="Reload this page" onclick="window.location.reload(false); return false">try again</a> in a few minutes.</p>
<p>See the error message at the bottom of this page for more information.</p>
</div>
</div>
<div class="footer"><p>If you report this error to the Wikimedia System Administrators, please include the details below.</p><p class='text-muted'><code>Request from 172.16.2.21 via cp1085.eqiad.wmnet, ATS/8.0.8<br>Error: 502, Server Hangup at 2021-01-26 14:21:35 GMT</code></p></div>
</html>
UNSERIALIZATION FAILED
Date/Time: Tue, 26 Jan 2021 14:52:19 +0000
Method: GET
URL: https://en.wikipedia.org/w/api.php
Parameters: Array
(
[action] => query
[prop] => info
[inprop] => protection|talkid|watched|watchers|notificationtimestamp|subjectid|url|readable|preload|displaytitle
[titles] => Wikipedia:Requests for adminship
[redirects] =>
[format] => php
[servedby] =>
[requestid] => 723665756
)
Raw Data:
UNSERIALIZATION FAILED
Date/Time: Tue, 26 Jan 2021 14:52:19 +0000
Method: GET
URL: https://en.wikipedia.org/w/api.php
Parameters: Array
(
[action] => query
[prop] => info
[inprop] => protection|talkid|watched|watchers|notificationtimestamp|subjectid|url|readable|preload|displaytitle
[titles] => Wikipedia:Articles for deletion/List of international cricket five-wicket hauls by Craig McDermott
[redirects] =>
[format] => php
[servedby] =>
[requestid] => 137476619
)
Raw Data:
UNSERIALIZATION FAILED
Date/Time: Tue, 26 Jan 2021 14:52:20 +0000
Method: GET
URL: https://en.wikipedia.org/w/api.php
Parameters: Array
(
[action] => query
[prop] => info
[inprop] => protection|talkid|watched|watchers|notificationtimestamp|subjectid|url|readable|preload|displaytitle
[titles] => New Hope Club
[format] => php
[servedby] =>
[requestid] => 574193594
)
Raw Data:
UNSERIALIZATION FAILED
Date/Time: Tue, 26 Jan 2021 14:52:20 +0000
Method: GET
URL: https://en.wikipedia.org/w/api.php
Parameters: Array
(
[action] => query
[prop] => revisions
[titles] => Wikipedia:Changing username/Simple
[rvprop] => timestamp|ids|user|comment|content
[rawcontinue] => 1
[rvdir] => older
[rvlimit] => 1
[format] => php
[servedby] =>
[requestid] => 533125398
)
Raw Data:
UNSERIALIZATION FAILED
Date/Time: Tue, 26 Jan 2021 14:52:20 +0000
Method: GET
URL: https://en.wikipedia.org/w/api.php
Parameters: Array
(
[action] => query
[prop] => info
[inprop] => protection|talkid|watched|watchers|notificationtimestamp|subjectid|url|readable|preload|displaytitle
[titles] => User:Cyberbot I/Run/Adminstatscy
[redirects] =>
[format] => php
[servedby] =>
[requestid] => 141685735
)
Raw Data:
UNSERIALIZATION FAILED
Date/Time: Tue, 26 Jan 2021 14:52:20 +0000
Method: GET
URL: https://en.wikipedia.org/w/api.php
Parameters: Array
(
[action] => query
[prop] => revisions
[titles] => Wikipedia:Requests for adminship/Ronjohn
[rvprop] => timestamp|ids|user|comment|content
[rawcontinue] => 1
[rvdir] => older
[rvlimit] => 1
[format] => php
[servedby] =>
[requestid] => 185024011
)
Raw Data:
UNSERIALIZATION FAILED
Date/Time: Tue, 26 Jan 2021 14:52:20 +0000
Method: GET
URL: https://simple.wikipedia.org/w/api.php
Parameters: Array
(
[action] => query
[prop] => info
[inprop] => protection|talkid|watched|watchers|notificationtimestamp|subjectid|url|readable|preload|displaytitle
[titles] => Ivan Turgenev
[redirects] =>
[format] => php
[servedby] =>
[requestid] => 770007772
)
Raw Data:
UNSERIALIZATION FAILED
Date/Time: Tue, 26 Jan 2021 14:52:23 +0000
Method: GET
URL: https://commons.wikimedia.org/w/api.php
Parameters: Array
(
[list] => allusers
[auprop] => blockinfo|groups|editcount|registration
[_limit] =>
[augroup] => sysop
[action] => query
[aulimit] => max
[rawcontinue] => 1
[format] => php
[servedby] =>
[requestid] => 452204742
)
Raw Data:
UNSERIALIZATION FAILED
Date/Time: Tue, 26 Jan 2021 14:52:29 +0000
Method: GET
URL: https://en.wikipedia.org/w/api.php
Parameters: Array
(
[action] => query
[prop] => info
[inprop] => protection|talkid|watched|watchers|notificationtimestamp|subjectid|url|readable|preload|displaytitle
[titles] => Wikipedia:Articles for deletion/List of international cricket five-wicket hauls by Craig McDermott
[redirects] =>
[format] => php
[servedby] =>
[requestid] => 137476619
)
Raw Data:
UNSERIALIZATION FAILED
Date/Time: Tue, 26 Jan 2021 15:13:41 +0000
Method: GET
URL: https://en.wikipedia.org/w/api.php
Parameters: Array
(
[list] => allusers
[auprop] => blockinfo|groups|editcount|registration
[_limit] =>
[augroup] => sysop
[action] => query
[aulimit] => max
[rawcontinue] => 1
[format] => php
[servedby] =>
[requestid] => 1010401488
)
Raw Data:
UNSERIALIZATION FAILED
Date/Time: Tue, 26 Jan 2021 15:18:22 +0000
Method: GET
URL: https://en.wikipedia.org/w/api.php
Parameters: Array
(
[action] => query
[prop] => revisions
[titles] => Mary I of England
[rvprop] => timestamp|ids|user|comment|content
[rawcontinue] => 1
[rvdir] => older
[rvlimit] => 1
[format] => php
[servedby] =>
[requestid] => 947306989
)
Raw Data:
UNSERIALIZATION FAILED
Date/Time: Tue, 26 Jan 2021 16:14:27 +0000
Method: GET
URL: https://en.wikipedia.org/w/api.php
Parameters: Array
(
[list] => allusers
[auprop] => blockinfo|groups|editcount|registration
[_limit] =>
[augroup] => sysop
[action] => query
[aulimit] => max
[rawcontinue] => 1
[format] => php
[servedby] =>
[requestid] => 1868822084
)
Raw Data:
UNSERIALIZATION FAILED
Date/Time: Tue, 26 Jan 2021 16:40:38 +0000
Method: GET
URL: https://en.wikipedia.org/w/api.php
Parameters: Array
(
[action] => query
[prop] => revisions
[titles] => America's Next Top Model (season 22)
[rvprop] => timestamp|ids|user|comment|content
[rawcontinue] => 1
[rvdir] => older
[rvlimit] => 1
[format] => php
[servedby] =>
[requestid] => 614076390
)
Raw Data:
UNSERIALIZATION FAILED
Date/Time: Tue, 26 Jan 2021 18:00:08 +0000
Method: GET
URL: https://en.wikipedia.org/w/api.php
Parameters: Array
(
[list] => allusers
[auprop] => blockinfo|groups|editcount|registration
[_limit] =>
[augroup] => sysop
[action] => query
[aulimit] => max
[rawcontinue] => 1
[format] => php
[servedby] =>
[requestid] => 832551312
)
Raw Data:
UNSERIALIZATION FAILED