Hi Michael,
I apologize, I really am not trying to be obtuse, I'm just confused :( Checking the link you sent - it says:
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HTTP::payload replace offset length string
Replaces the amount of content that you specified with the length argument, starting at offset with string, adjusting the Content-Length header appropriately.
To clarify, the length argument should be the length of original content to replace. In order to replace the entire payload, the offset should be 0 and the length should be the original size in bytes of the payload. The original content length can typically be retrieved using [HTTP::header value Content-Length].
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If I am trying to replace the entire original payload, don't I need to send the length of the original payload to the replace command, not the length of the new payload? I'm not following :(
Thanks,
Jen