Can I override the Host header where using java’s HttpUrlConnection class?

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This used to work in the past, but it has been disabled as part of a security-fix. Apparently without a note in the changelog. There are even bugs like #7022056 for this at bugs.sun.com.

There is a similar question for another header, where the answer goes more into the details, so I just link it instead of writing it myself. 🙂

The only workarounds seem to be setting sun.net.http.allowRestrictedHeaders to true or use another http-library like the already mentioned http components.

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