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These are the changes from Apache Traffic Server v3.2 to v4.0. If you are upgrading from v3.0 or earlier, please see the upgrade instructions to v3.2. Note that not all these changes might affect your configuration, but you are encouraged to verify that your configurations are in line with the changes in these upgrade documents.

Body Factory now used for Customizable User Response Pages

Body Factory is now enabled by default - the stock templates are located in the /usr/local/etc/trafficserver/body_factory/default folder. Please be aware of https://issues.apache.org/jira/browse/TS-2217 - Body Factory cannot be disabled and use of proxy.config.body_factory.enable_customizations = 0 will result in empty responses for errors.

Remap processor threads

We have eliminated the old configuration proxy.config.remap.use_remap_processor, and instead it's all controlled via the proxy.config.remap.num_remap_threads configuration. The default for the number of remap threads is now 0, which means that the remap processor threads feature is disabled. To enable the remap processors, set this configuration to a value greater than 0.

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