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There is a weird quirk in HTTP. You can send the same header twice. For this reason, headers are represented by a dict, with lists as the values. However, it appears that HTTPlib is completely incapable of sending the same header twice. This puts me in a weird position: I want to be able to accurately represent HTTP headers in cassettes, but I don't want the extra step of always having to do [0] in the general case, i.e. request.headers['key'][0] In addition, some servers sometimes send the same header more than once, and httplib *can* deal with this situation. Futhermore, I wanted to keep the request and response cassette format as similar as possible. For this reason, in cassettes I keep a dict with lists as keys, but once deserialized into VCR, I keep them as plain, naked dicts.