Learning Scala Web Development (Video 20)

The video tutorial introduces the concept of caching in web services and APIs, emphasizing its importance in improving performance. It covers various caching techniques supported by the HTTP protocol, such as cache control headers and entity tags (E-tags). The tutorial explains how caching can speed up request processing by serving data from the cache instead of fetching it anew. It also highlights the challenges of cache invalidation. The video concludes with a brief overview of the spray caching module, which will be explored in the next section.

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