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No GZip Compression over HTTP #4815
Just to follow up, as I expect his may be useful to other developers: This issue was caused by anti-virus software running locally. It appears it was intercepting the compressed content and returning the uncompressed file, and correctly altering the HTTP headers. Despite me disabling the AV protection while testing the issue, it was still monitoring and modifying the HTTP traffic. The anti-virus software is ESET NOD32 Antivirus 8.
To ensure you see the unmodified (gzipped) HTTP traffic in the browser, you need to disable HTTP checking (see here):