set(url "file://@CMAKE_CURRENT_SOURCE_DIR@/FileDownloadInput.png")
set(dir "@CMAKE_CURRENT_BINARY_DIR@/downloads")

message(STATUS "FileDownload:1")
file(DOWNLOAD
  ${url}
  ${dir}/file1.png
  TIMEOUT 2
  )

message(STATUS "FileDownload:2")
file(DOWNLOAD
  ${url}
  ${dir}/file2.png
  TIMEOUT 2
  SHOW_PROGRESS
  )

# Two calls in a row, exactly the same arguments.
# Since downloaded file should exist already for 2nd call,
# the 2nd call will short-circuit and return early...
#
if(EXISTS ${dir}/file3.png)
  file(REMOVE ${dir}/file3.png)
endif()

message(STATUS "FileDownload:3")
file(DOWNLOAD
  ${url}
  ${dir}/file3.png
  TIMEOUT 2
  EXPECTED_MD5 d16778650db435bda3a8c3435c3ff5d1
  )

message(STATUS "FileDownload:4")
file(DOWNLOAD
  ${url}
  ${dir}/file3.png
  TIMEOUT 2
  EXPECTED_MD5 d16778650db435bda3a8c3435c3ff5d1
  )