User Request Origin Server Header Translated Header | Intel 1520

In these examples, the second rule is never applied because all URL addresses that match the second rule also match the ﬁrst rule. The ﬁrst rule takes precedence because it appears earlier in the remap.config ﬁle.

Example 4 A mapping with a path preﬁx speciﬁed in the target and replacement:

map http://www.h.com/a/b http://server.h.com/customers/x/y

This rule results in the following translation:

User Request

Translated Request

http://www.h.com/a/b/c/d/ http://server.h.com/customers/x/y/c/d/

doc.htmldoc.html

http://www.h.com/a/index.html	Translation fails

Example 5 Reverse mapping:

map http://www.x.com/ http://server.hoster.com/x/

reverse_map http://server.hoster.com/x/ http://www.x.com/

These rules result in the following translations:

User Request

Translated Request

http://www.x.com/ http://server.hoster.com/x/Widgets

Widgets

For browsers that do not support host headers

User Request	Origin Server Header	Translated Header

http://www.x.com/	http://server.hoster.com/	http://www.x.com/
Widgets	x/Widgets/	Widgets/

When accelerating multiple servers, the appliance is unable to route to URL addresses from older browsers that do not send the Host: header. The best solution is to direct the user to a page that explains the situation and advises a browser upgrade or provides a link directly to the origin server, bypassing the appliance. For information on how to do this, see Setting server accelerator options‚ on page 43.

134Intel NetStructure Cache Appliance Administrator’s Guide

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Intel 1520 manual User Request Origin Server Header Translated Header

Contents

Intel NetStructure 1520 Cache Appliance Copyright 2000, Intel Corporation. All rights reserved Contents Configuring the Appliance Using the Command-Line Interface Troubleshooting Problems 109 Error Messages 151 Changing network address configuration on the NIC Contents 106 Preface Convention Purpose Who should read this manualConventions used in this manual Bold Chapter Introduction Flexible cache architecture What is an Intel NetStructure Cache Appliance?Why use this caching appliance? Web proxy cache Intel NetStructure Cache Appliance features High-speed caching Secure, single-point administrationMultithreading process support Broad protocol support Performance reporting How to use this guideSnmp Network Management To find out about … See …Page Getting Started Controls and physical features on your system Starting the system for the first time Command-line interface‚ on Hhmmss Getting Started Accessing the Manager UI Using Monitor and Configure mode Dashboard Monitor mode frame Configure mode frame Changing passwords Using online helpAccessing the command-line interface Verifying that caching worksPage Monitoring Appliance Performance Accessing monitor pages Using the Dashboard Exposing node detail Resolving alarmsDashboard alert lights Alert light Condition Description Using the Node Changing the selected node Using the Cache Using the GraphsUsing the Protocols Using the ARM Using the Other Using the Mrtg Configuring the Appliance Accessing configure pages Using the Server Basics Option Description Setting general optionsNetStructure Cache section Using virtual IP addressing for node failover Setting Web management optionsSetting virtual IP addressing options What are virtual IP addresses? Adding entries to the Virtual IP address list Configuring load-shedding Setting browser auto configuration optionsSetting throttling of network connections Enabling Snmp agents Configuring Http Option Definition Configuring Nntp Name and port see Option Definition Configuring FTP FTP Cache activation Storage Freshness For IMS If Modified Since revalidation requests Variable content Following table describes the variable conﬁguration options Link displays the Change Administrator’s Password Using the SecurityUsing the Routing Setting Http parent caching options Setting ICP options Establishing ICP peers Field Description Setting server accelerator options Option Description Checking Wccp Using the Host DatabaseChecking transparency Configuring the host database Another invalid hostname message to the user Configuring DNS Using the Snapshots Reaching the Snapshots Using the Command-Line Interface Starting the appliance the first time Starting the command-line interfaceUsing the appliance after initial start-up Navigating the command-line interface To do this Do this Using the setup menu Changing network addresses configuration Changing the gateway address Changing the controller speed and transmission modeChanging the DNS address and domain name Viewing current network address settings Configuring time zone settingsConfiguring date and time settings Using the main menu Stopping the appliance Checking the status of the Server and ManagerStarting the appliance Installing a new version of the appliance software Viewing and maintaining versions of the software Application upgrade Running a different version of the appliance software Patch upgradeOS/Application upgrade Clearing statistics Deleting a version of the appliance software Rebooting the System Halting the System Preparing a cache disk Resetting to factory settingsUsing the config menu Setting general controls Configuring protocol options Configuring Http options Configuring Nntp options Conﬁguring Nntp servers Following table describes the tags you can use in a rule Tag Description Tag Description Examples Conﬁguring Nntp access Following table lists the access directive options If access is Authenticator is User is Pass is Configuring Secure Socket Layer SSL port Configuring FTP options Setting filter rules Primary Destination Allowed Value Secondary Specifier Allowed Value Action Value Setting remap rules Target Configuring the cache Enabling caching for different protocols Setting disk storage options Setting object freshness options Following table shows the options Configuring caching rules Request URL method use one of the following Destip=112.12.12.12 scheme=ftp action=never-cache Configuring security options Controlling client access to the appliance Controlling access to the Manager UI Viewing and modifying ICP rules Configuring routing optionsConfiguring and maintaining ICP peers Following table describes each ﬁeld Example Mcttl Viewing current ICP settings Enabling and disabling ICP Enabling and disabling multicast in ICP Setting the ICP port numberSetting the ICP query timeout Controlling parent proxy caching Secondary Specifiers Allowed Value Action Tag Allowed Value Action Tag Allowed Value Configuring Wccp options Configuring the Adaptive Redirection Module ARM Enabling and disabling transparent redirection Configuring ARM bypass rules Rule Description Bypass rules have the following format Rule Format Configuring the host database options Configuring load-shedding options Option Description Configuring logging options Statistic Description Cache Using the monitor menuViewing Node statistics Progress Network Viewing Protocol statisticsStatistic Description Statistics Description Statistics Description Client Server Statistics Description Operations From this Node Statistics Description QueriesOriginating Viewing Cache statistics From ICP Peers Viewing Other statistics Statistic Description Using the expert menu Using the logoff menu Using the save menuUsing the load menu Troubleshooting Problems Rebooting your system Rebooting your system from the CLI Upgrading software Page Caching Solutions and Performance Appendix a Web proxy caching Day in the life of a cache request Ensuring cached object freshness Cache miss Expires header test Revalidating objectsHttp object freshness tests Last-Modiﬁed / Date header test Revalidate rules Default testDeciding whether to serve Http objects Configuring Http freshness options Configuring Http revalidation To cache or not to cache? Configuring Http cachabilityCaching Http alternates Transparent proxy caching Directive source Caching directives Serving requests transparently Interception strategies Using a layer 4-aware switch to filter transparency requests Using a WCCP-enabled router for transparency Using policy-based routing to filter transparency requests Using a router to ﬁlter Http requests ARM redirection More about bypass rules Adaptive interception bypassAppliance adaptive bypass Source bypass Configuring bypass optionsStatic and dynamic adaptive bypass Destination bypass Server acceleration Retrieving requested documents Advantages of server accelerationHow server acceleration works Whereas the corresponding proxy request would look like this Web server redirects Understanding server acceleration mapping rules Examples of rules and translations User Request Translated Request User Request Origin Server Header Translated Header Understanding cache hierarchies Http cache hierarchies ICP cache hierarchies Miss Nntp cache hierarchies Bombay News article caching Supporting several parent news servers Appliance as a news serverAppliance as a caching proxy news server Several news servers supplying the same groups Blocking particular groupsClustering Several servers supplying different groups Posting Maintaining the cache updates and feedsTransparency Pull the overview information for speciﬁed groups Dynamically subscribe to speciﬁed groups Configuring Access controlPull the articles for speciﬁed groups Take a partial feed push for speciﬁed groups Client bandwidth throttling Self-tuning DataFlow coreObeying Nntp control messages Carrier-class architecture Alias-free caching Fine-grained parallelismRaw-disk object store Fast space reclamation High-availability AlarmsAdvanced protocol features Fast kernel packet engine Virtual IP failover Monitor Dashboard Load shedding Node fault toleranceExpansion capabilities Centralized administration Client ACL Page Error Messages Appendix B Html messages sent to clients Title Code Description Appendix B Error Messages 153 Standard Http response messages Message Description Appendix B Error Messages 155 Page Glossary DNS ISP POP Wccp Page Index News server features