R中有HTTP库吗?

对, RCurl

library(RCurl)
# example from the vignette:
x = postForm('http://www.wormbase.org/db/searches/advanced/dumper', 
  species="briggsae", 
  list="", 
  flank3="0", 
  flank5="0", 
  feature="Gene Models", 
  dump = "Plain TEXT", 
  orientation = "Relative to feature", 
  relative = "Chromsome", 
  DNA ="flanking sequences only", 
  .cgifields =c("feature", "orientation", "DNA", "dump", "relative"))

如果希望对已发布的实体和头进行细粒度控制,可以使用 curlPerform 直接。