Hi, Currently there is a header name enum in the client api. Yet in commons we also have the HTTPHeader interface with constants for the most common headers. Since this seems redundant I would suggest to remove the enum since this enum can never contain all available headers. For convenience there is still the HttpHeader interface in the commons module which allows for an access via constants.
I have created a branch with the necessary changes[1]. If there are no objections I will go ahead and merge the changes. WDYT? Best Regards, Christian [1] https://git-wip-us.apache.org/repos/asf?p=olingo-odata4.git;a=shortlog;h=refs/heads/olingo712
