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Brendan WhitingFront End Web Development Techdegree Graduate 84,698 Points
They want you to pass in the number of bytes in the request, which is the number of characters in the post body. They list the post body as:
name=Saraemail@example.com. You can count characters manually or with a tool like this.
This is something you won't have to do in real life, it's just an exercise to understand how things work under the hood in HTTP.