Might some things break because header information is changed?
Possibly. If used with a browser less advanced than Netscape 3.0 or IE-3, indicating an advanced browser may encourage pages containing extensions that confuse your browser. If this becomes a problem upgrade your browser or use the -u option to indicate an older browser. In Version 1.4 and later you can selectively reveal your real browser to only those sites you nominate. Some sites depend on getting a referer header. Wired News relies on referer to decide whether to add a navigation column to the page, so blocking referer causes extraneous columns. In Version 1.4 and later you can use the -r @ option and place a line like >wired.com/news/ in your cookiefile. The weather maps of Intellicast have been blocked by their server when no referer or cookie is provided. You can use the same countermeasure with the line >208.194.150.32 (or simply get your content elsewhere.