/// <summary>
/// Calculates the version based on the ODataUri provided
/// </summary>
/// <param name="request">Request to calculate from</param>
/// <param name="maxProtocolVersion">Max Protocol version of the server</param>
/// <returns>Data Service Protocol Version</returns>
public DataServiceProtocolVersion CalculateMinResponseVersion(ODataRequest request, DataServiceProtocolVersion maxProtocolVersion)
{
ExceptionUtilities.CheckArgumentNotNull(request, "request");
ExceptionUtilities.Assert(maxProtocolVersion != DataServiceProtocolVersion.Unspecified, "Max protocol version cannot be unspecified when calculating the MinVersion");
string contentType = request.GetHeaderValueIfExists(HttpHeaders.Accept);
DataServiceProtocolVersion maxDataServiceVersion = VersionHelper.ConvertToDataServiceProtocolVersion(request.GetHeaderValueIfExists(HttpHeaders.MaxDataServiceVersion));
HttpVerb effectiveVerb = request.GetEffectiveVerb();
if (contentType == null)
{
contentType = MimeTypes.Any;
}
if (effectiveVerb == HttpVerb.Post || effectiveVerb.IsUpdateVerb())
{
DataServiceProtocolVersion version = DataServiceProtocolVersion.V4;
string preferHeaderValue = request.GetHeaderValueIfExists(HttpHeaders.Prefer);
// Bump to Version 3 if prefer header is specified and its > V3 server
if (preferHeaderValue != null && request.PreferHeaderApplies(maxProtocolVersion))
{
version = version.IncreaseVersionIfRequired(DataServiceProtocolVersion.V4);
}
// for insert or update, versioning is specific to the type
EntityType expectedEntityType;
if (TryGetExpectedType(request, out expectedEntityType))
{
version = VersionHelper.IncreaseVersionIfRequired(version, VersionHelper.CalculateProtocolVersion(expectedEntityType, contentType, VersionCalculationType.Response, maxProtocolVersion, maxDataServiceVersion));
}
return(version);
}
return(VersionHelper.CalculateUriResponseMinProtocolVersion(request.Uri, contentType, maxProtocolVersion, maxDataServiceVersion));
}