idhttp 如何post-Expect: 100-continue Expect: 100-continue

idhttp 怎么post-Expect: 100-continue Expect: 100-continue
idhttp1.Request.RawHeaders.Values['Expect'] := '100-continue网上查是这个，不过好像没效果

[解决办法]
IdHTTP1.Request.CustomHeaders.Add('Expect: 100-continue');