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Fluxzy is a MITM HTTP debugging proxy designed for developers and network engineers who need to intercept, inspect, and modify HTTP/1.1, HTTP/2, and WebSocket traffic in real time. Published by Fluxzy SAS and currently at version 1.35.16.14941, the tool provides a transparent proxy layer that sits between client applications and remote servers, capturing every request and response without requiring code changes or root certificates on the device under test. Its primary purpose is to accelerate troubleshooting of API integrations, mobile app back-ends, and single-page applications by revealing exact payload contents, timing data, and protocol-level anomalies. Typical use cases include reproducing elusive production bugs by replaying recorded sessions, simulating slow or unreliable networks through configurable latency and bandwidth throttling, and injecting faults or custom headers to validate server resilience. The engine supports both plain-text and TLS-encrypted traffic, automatically generating and signing certificates on the fly so that HTTPS streams can be decrypted and re-encrypted without alerting the client. A built-in rule system allows conditional alteration of requests or responses, enabling scripted redirects, authentication bypasses, or A/B testing scenarios. Because the proxy exports standard HAR and PCAP files, captured data can be shared with teammates or fed into external analyzers. Six successive releases have refined the user interface, added HTTP/3 preview support, and improved performance under high concurrency, making Fluxzy suitable for everything from local debugging on a laptop to continuous integration pipelines that validate microservice contracts. The software is available for free on get.nero.com, with downloads provided via trusted Windows package sources (e.g. winget), always delivering the latest version, and supporting batch installation of multiple applications.
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