Some responses cannot be decrypted. Sample HAR file: https://mega.nz/#!pBUhCAxb!HF7wahVT1RJog9dHNc3NQji5nZ3BNrVFzrkWJ1GI1S0 for example, search for: lrR/zv7/RNCaLj/9XY472V/Z1yMyt/KYbZU/Og8JiI/ It is readable in Chrome dev tools the same request in https://toolbox.googleapps.com/apps/har_analyzer/