Tag: caching

Using Command Query Responsibility Segregation to speed up data-driven web applications

Typical web applications spend most of their time reading data from a data storage (i.e. a database) which is then processed and converted to HTML for the desired frontend visualization. Furthermore, when relying on programming languages such as PHP that are essentially based on the “shared nothing principle” the performance overhead for consecutive processing of […]

Disable caching of API callbacks for Viveum Magento extension

Using a caching server like Varnish is mandatory for running Magento (efficiently). When using extensions that make use of callback API calls make sure that you exclude them from your caching rules. As we are using Viveum as payment gateway service for most eCommerce projects we generally deploy the official Viveum Magento extension. When using […]

Magento Error ESI processing not enabled

In a recent Magento setup with a Varnish caching server an undefined PHP variable in a template resulted in the error message “ESI processing not enabled“. Due to the undefined PHP variable the underlying Varnish caching server’s Edge-side includes (ESI) capabilities, allowing content assembly by HTTP surrogates through in-markup XML-based language failed. After a quick […]