Getting R and D3.js to play nicely in R markdown

great intro! i just have one problem when I try to src d3 in my rmd. The execution is halted, whether I put it in the header.html file or in the body of the rmd. ever run into that before? It says:

pandoc: Could not fetch
HttpExceptionRequest Request {
 host = “”
 port = 443
 secure = True
 requestHeaders = []
 path = “/d3.v4.min.js”
 queryString = “”
 method = “GET”
 proxy = Nothing
 rawBody = False
 redirectCount = 10
 responseTimeout = ResponseTimeoutDefault
 requestVersion = HTTP/1.1
 (InternalException (HandshakeFailed Error_EOF))
Error: pandoc document conversion failed with error 67
Execution halted

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