Allow Saving of Octet Stream in API (#5130)
Allow Saving of Octet Stream in API (#5130)

* Allow downloading of octet stream

* Refactor solution

* Match lowercase ContentType
JKarathiya/Lean,jameschch/Lean,JKarathiya/Lean,jameschch/Lean,StefanoRaggi/Lean,QuantConnect/Lean,QuantConnect/Lean,JKarathiya/Lean,jameschch/Lean,QuantConnect/Lean,AlexCatarino/Lean,AlexCatarino/Lean,jameschch/Lean,QuantConnect/Lean,AlexCatarino/Lean,StefanoRaggi/Lean,StefanoRaggi/Lean,StefanoRaggi/Lean,JKarathiya/Lean,AlexCatarino/Lean,StefanoRaggi/Lean,jameschch/Lean