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Why Businesses Lose Customers Online
We examine what hinders small businesses from attracting customers online—from outdated websites to weak positioning
From ideas to practice
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Webhook Signature Is Valid: How to Stop a Replay of a Correct Request
We analyze a replay attack on a correctly signed webhook: signing the timestamp and nonce, verifying the time window, and showing why worker local memory loses protection after a restart.
ETag and If-Match: How to Avoid Overwriting Stock During Dual API Updates
A practical guide to protecting APIs from stale records: two clients read the same product, the first updates the stock, the second receives a 412 and retries the update only after a new GET.
How to Find Which Process Is Listening on a Port in Linux
Check TCP and UDP via ss, analyze the binding address, and distinguish a local listening socket from service availability from the internet.
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