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Bug introduced in V11.0 and persisting through 11.3

[CASE:3981157] confirmed

asso = <| "Scheme" -> "http" , "Domain" -> "www.wolframalpha.com/" , "ContentType" -> "application/json" |>;

This is a valid and documented syntax:

HTTPRequest @ asso //InputForm 
HTTPRequest[ <|"Scheme" -> "http", "Domain" -> "www.wolframalpha.com/"|> , <|"ContentType" -> "application/json"|> ]

but it breaks when one provides options:

HTTPRequest[asso, CharacterEncoding -> Automatic] // InputForm 
HTTPRequest[ <|"Scheme" -> "http", "Domain" -> "www.wolframalpha.com/", "ContentType" -> "application/json"|> , <||> , CharacterEncoding -> Automatic ]

So it was not split correctly on url and metadata part. Which will result in malformed request.

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1 Answer 1

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So before it is fixed one needs to arrange full input with help of e.g. URLBuild:

HTTPRequest[ URLBuild@asso, asso, CharacterEncoding -> Automatic ] // InputForm 
HTTPRequest[ "http://www.wolframalpha.com//" , <|..., "ContentType" -> "application/json"|> , CharacterEncoding -> Automatic ]
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