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Any declaration in the HTTP header will override information inside the page, causing problems for your content.
You may not have control over the declarations that come with the HTTP header, and may have to contact the people who manage the server for help. On the other hand there are sometimes ways you can fix things on the server if you have limited access to server setup files or are generating pages using scripting languages. For example, see Setting the HTTP charset parameter [w3.org] for more information about ...
It is very important to always label Web documents explicitly. HTTP 1.1 says that the default charset is ISO-8859-1. But there are too many unlabeled documents in other encodings, so browsers use the reader's preferred encoding when there is no explicit charset parameter.