The proxy server received an invalid response from an upstream server là gì

502 Proxy Error – The proxy server received an invalid response from an upstream server. The proxy server could not handle the request.
Reason: Error reading from remote server.
Web server: Apache/2.2.15 (Oracle)
When i try to load the Webpage URL (URI) which ends with .ece , I found the error.
What is .ece format webpage: Web page dynamically generated by the Escenic Content Engine, an advanced platform for Web publishing and content management; typically contains server-side code that is parsed by the Web server, which generates HTML for the Web page.

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We are building a mass mailing sending application in Java. Mail is being send by third party SMTP. After sending 400-500 mails tomcat6 service get stopped. Below is the error.

Proxy Error The proxy server received an invalid response from an upstream server. The proxy server could not handle the request GET /lin/Campaignn.jsp. Reason: Error reading from remote server

Additionally, a 502 Bad Gateway error was encountered while trying to use an ErrorDocument to handle the request.

Apache Server at msizzler.com Port 80

But when we are sending from localhost I did not received any error. It send all the mails. Please help me to sort it out this problem.

Yurets

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asked Dec 5, 2013 at 17:36

Ranjeet RanjanRanjeet Ranjan

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1

The HTTP 502 "Bad Gateway" response is generated when Apache web server does not receive a valid HTTP response from the upstream server, which in this case is your Tomcat web application.

Some reasons why this might happen:

• Tomcat may have crashed
• The web application did not respond in time and the request from Apache timed out
• The Tomcat threads are timing out
• A network device is blocking the request, perhaps as some sort of connection timeout or DoS attack prevention system

If the problem is related to timeout settings, you may be able to resolve it by investigating the following:

• ProxyTimeout directive of Apache's mod_proxy
• Connector config of Apache Tomcat
• Your network device's manual

answered Jan 29, 2014 at 2:18

0

Add this into your httpd.conf file

Ian Hunter

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answered Feb 18, 2014 at 9:23

7

The java application takes too long to respond(maybe due start-up/jvm being cold) thus you get the proxy error.

As Albert Maclang said amending the http timeout configuration may fix the issue. I suspect the java application throws a 500+ error thus the apache gateway error too. You should look in the logs.

answered Sep 28, 2014 at 1:56

Anthony HuntAnthony Hunt

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I had this issue once. It turned out to be database query issue. After re-create tables and index it has been fixed.

Although it says proxy error, when you look at server log, it shows execute query timeout. This is what I had before and how I solved it.

DimaSan

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answered Oct 26, 2016 at 19:29

CincyBellaCincyBella

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