Writing a download server. Part IV: Implement HEAD operation (efficiently)

HEAD is an often forgotten HTTP method (verb) that behaves just like GET, but does not return body. You use…

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Writing a download server. Part III: headers: Content-length and Range

We will explore more HTTP request and response headers this time to improve download server implementation: Content-length and Range. The…

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Writing a download server. Part II: headers: Last-Modified, ETag and If-None-Match

Caching on the client side is one of the foundations of World Wide Web. Server should inform client about validity…

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Writing a download server. Part I: Always stream, never keep fully in memory

Downloading various files (either text or binary) is a bread and butter of every enterprise application. PDF documents, attachments, media,…

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How LongAccumulator and DoubleAccumulator classes work?

Two classes new in Java 8 deserve some attention: LongAccumulator and DoubleAccumulator. They are designed to accumulate (more on what…

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Spring: injecting lists, maps, optionals and getBeansOfType() pitfalls

If you use Spring framework for more than a week you are probably aware of this feature. Suppose you have…

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Biological computer simulation of selfish genes

TL;DR: I did a computer simulation of behavior evolution of monkeys, continue reading to see how problem was stated originally…

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CompletableFuture can’t be interrupted

I wrote a lot about InterruptedException and interrupting threads already. In short if you call Future.cancel() not inly given Future…

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Journey to idempotency and temporal decoupling

Idempotency in HTTP means that the same request can be performed multiple times with the same effect as if it…

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