S3 object to define respose writer.
This S3 object allows you to control how the response body is saved.
- Class name and fields. Used in class constructors.
write_functionobject to process.
There are three key methods:
write_init(): called before the write is started. It should return a modified object.
write_opts(): returns a list options passed on to RCurl
write_term(): called after the request is complete. Should return the content (or a pointer to it)
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