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I am getting the error message below when I run a HTTP Triggered function app on our main slot :
Status: 502 Bad Gateway
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"/>
<title>502 - Web server received an invalid response while acting as a gateway or proxy server.</title>
<style type="text/css">
<!--
body{margin:0;font-size:.7em;font-family:Verdana, Arial, Helvetica, sans-serif;background:#EEEEEE;}
fieldset{padding:0 15px 10px 15px;}
h1{font-size:2.4em;margin:0;color:#FFF;}
h2{font-size:1.7em;margin:0;color:#CC0000;}
h3{font-size:1.2em;margin:10px 0 0 0;color:#000000;}
#header{width:96%;margin:0 0 0 0;padding:6px 2% 6px 2%;font-family:"trebuchet MS", Verdana, sans-serif;color:#FFF;
background-color:#555555;}
#content{margin:0 0 0 2%;position:relative;}
.content-container{background:#FFF;width:96%;margin-top:8px;padding:10px;position:relative;}
-->
</style>
</head>
<body>
<div id="header"><h1>Server Error</h1></div>
<div id="content">
<div class="content-container"><fieldset>
<h2>502 - Web server received an invalid response while acting as a gateway or proxy server.</h2>
<h3>There is a problem with the page you are looking for, and it cannot be displayed. When the Web server (while acting as a gateway or proxy) contacted the upstream content server, it received an invalid response from the content server.</h3>
</fieldset></div>
</div>
</body>
</html>But when I tried to create a new slot and function app with the same exact code, it works fine without getting the error above. It seems like there's an issue with our main slot's configuration but I just can't find any resource to point me to it.
Has anyone else encountered this problem? How did you fix it?
265
asked Oct 05 '17 10:10
After configuring an application gateway, one of the errors that you may see is "Server Error: 502 - Web server received an invalid response while acting as a gateway or proxy server". This error may happen for the following main reasons: NSG, UDR, or Custom DNS is blocking access to backend pool members.
Note: A Gateway might refer to different things in networking and a 502 error is usually not something you can fix, but requires a fix by the web server or the proxies you are trying to get access through.
Server overload: An overloaded server is one of the most common causes of a 502 error. This is where the server has reached its memory capacity, often activated by an unusually high number of visitors trying to access the same website.
I have this problem when I sent object from MongoDB (by Mongoose method: Model.find()) directly to the response.
Claim.find()
.then(claims => {
context.res = {
status: 200,
headers: {
'Content-Type': 'application/json',
'Access-Control-Allow-Origin': '*'
},
body: claims
};
context.done();
})
I must change this body object to:
Claim.find()
.then(claims => {
context.res = {
status: 200,
headers: {
'Content-Type': 'application/json',
'Access-Control-Allow-Origin': '*'
},
body: JSON.parse(JSON.stringify(claims))
};
context.done();
})
I have seen 502 error many times in different situations.
Most times it is my programming mistake/ config issue.
But today it took a lot more time to find this issue, so sharing here.
Issue #1
s3 = new AWS.S3();
AWS.config.loadFromPath(dirName1 + '\\aws-config.json');
s3.listObjectsV2(..);
Here, though the error is at line 1, the issue happens at line 3
Solution is:
AWS.config.loadFromPath(dirName1 + '\\aws-config.json');
s3 = new AWS.S3();
s3.listObjectsV2(..);
That is, after loading the aws config, we need to create s3 new instance variable.
Issue #2
As given here, https://stackoverflow.com/a/39240447/984471, is about writing file to un-accessible directory, while you can write to D:\local\Temp, we can't write other directories like current directory or D:\
Unfortunately, in the above examples and also other instances I had, the Azure function exists without any log in azure function console, so there is need for a lot debugging required.
1
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