Test for COUCHDB-1679. Showing how the etag breaks cors
Check that the content-type from the RequestHeaders is not undefined. Fixes COUCHDB-1697
Apply _list functions for _all_docs view. COUCHDB-1139
Merge branch '1697-fix-if-non-match-cors'
Fauxton Duplicate Document
Duplicates the current document using Couchdb's COPY api.

Resolves COUCHDB-1828

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