Removing Accept-Encoding: header for udd.js file could cause http 406 problem and http status 401 - this request requires http authentication

Knowledge Article

Article Number

000329169

Old Article Number

000129750

Article Type

Solutions to a Product Problem

Title

Removing Accept-Encoding: header for udd.js file could cause http 406 problem and http status 401 - this request requires http authentication - Remedy AR System Mid Tier

Summary

Proxies may remove some http headers in order to optimize traffic. There is a particular file,udd.js, that requires Accept-Encoding header under certain circumstances

Product

Remedy AR System Server

Component

AR System Mid Tier

Applies to

All MidTier Supported Versions

Problem

Network infrastructure may remove some HTTP headers like

Accept-Encoding: gzip, deflate

If this header is removed when a request is made for a form which includes the delivery of the udd.js resource, Midtier (not tomcat) will create an HTTP 406 error and also possibly HTTP status 401 - this request requires http authentication

Cause

The midtier client requires the udd.js to display the form. If the content cannot be produced because the header has been removed, the midtier sends only the error code

Solution

This knowledge article may contain information that does not apply to version 21.05 or later which runs in a container environment. Please refer to Article Number 000385088 for more information about troubleshooting BMC products in containers.

1. Disable Midtier compression

Open your MIDTIER\WEB-INF\classes\config.properties file
Change the line,

arsystem.compression_index=1

arsystem.compression_index=0

2. Optional but recommended - Enable tomcat compression
To enable Tomcat compression on the http connector:

Edit the tomcat../conf/server.xml
Locate the HTTP connector and add the attributes, compressableMimeType="text/html,text/xml,text/css,text/javascript,application/x-javascript,application/javascript" compression="on" compressionMinSize="128"

Ex: <Connector port="8080" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8443" allowTrace="false" compressableMimeType="text/html,text/xml,text/css,text/javascript,application/x-javascript,application/javascript" compression="on" compressionMinSize="128" />

Please make sure your compressableMimeType attribute contains the same Mime Type as udd.js "Content-Type: text/javascript"
You can use Fiddler or the native browser tools F12 to check the response for the udd.js call

If Tomcat is not the webserver/servlet engine used in your architecture, check how to enable compression on your JSP engine dependant on the webserver..

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