httpuv: HTTP and WebSocket server library for R

httpuv provides low-level socket and protocol support for handling HTTP and WebSocket requests directly from within R. It is primarily intended as a building block for other packages, rather than making it particularly easy to create complete web applications using httpuv alone. httpuv is built on top of the libuv and http-parser C libraries, both of which were developed by Joyent, Inc.

Installing

You can install the stable version from CRAN, or the development version using devtools:

# install from CRAN
install.packages("httpuv")

# or if you want to test the development version here
if (!require("devtools")) install.packages("devtools")
devtools::install_github("rstudio/httpuv")

Since httpuv contains C code, you'll need to make sure you're set up to install packages. Follow the instructions at http://www.rstudio.com/ide/docs/packages/prerequisites

Debugging builds

httpuv can be built with debugging options enabled. This can be done by uncommenting these lines in src/Makevars, and then installing. The first one enables thread assertions, to ensure that code is running on the correct thread; if not. The second one enables tracing statements: httpuv will print lots of messages when various events occur.

PKG_CPPFLAGS += -DDEBUG_THREAD -UNDEBUG
PKG_CPPFLAGS += -DDEBUG_TRACE

To install it directly from Github with these options, you can use with_makevars, like this:

withr::with_makevars(
  c(PKG_CPPFLAGS="-DDEBUG_TRACE -DDEBUG_THREAD -UNDEBUG"), {
    devtools::install_github("rstudio/httpuv")
  }, assignment = "+="
)

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