Multi language website

I have read some articles on the web on how to make a Website have multi language but also SEO friendly.

These are the examples they suggested:

Multiple ccTLD's

Subdirectories for every language

Subdomains for every language

But is it possible to have the website use the same url's for all languages?

Using the HTTP Header accept-language from the browser and returning the language with the highest q value.

And if the users selects a specific language from a select to use that language.

I have read someone I should set the HTTP Header 'vary' to 'accept-language' to prevent caching problems.

But I'm wondering if this method is bad for Search Engines.

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