I'd like to access an API from within R but I'm not sure how to do so. The
API uses HTTP and supports both POST and PUT methods. I'm able to access it
successfully from the terminal using the following curl command:
curl --data @genes.xml http://api-url

Where genes.xml is a local file containing the genes I want to submit and
http://api-url is the API's address. However, I'm not sure how to replicate
this command in R. The request payload and response payload are both XML
streams, so I'm fairly certain this will require a combination of the RCurl
and XML packages, but I've had no luck getting RCurl to work. I'd really
appreciate some help with this.

Thanks,
Aaron

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