curl
A Modern and Flexible Web Client for R
Description
Bindings to 'libcurl' <https://curl.se/libcurl/> for performing fully configurable HTTP/FTP requests where responses can be processed in memory, on disk, or streaming via the callback or connection interfaces. Some knowledge of 'libcurl' is recommended; for a more-user-friendly web client see the 'httr2' package which builds on this package with http specific tools and logic.
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CRAN Check Status
Show all 14 flavors
| Flavor | Status |
|---|---|
| r-devel-linux-x86_64-debian-clang | OK |
| r-devel-linux-x86_64-debian-gcc | OK |
| r-devel-linux-x86_64-fedora-clang | OK |
| r-devel-linux-x86_64-fedora-gcc | OK |
| r-devel-macos-arm64 | OK |
| r-devel-windows-x86_64 | OK |
| r-oldrel-macos-arm64 | NOTE |
| r-oldrel-macos-x86_64 | NOTE |
| r-oldrel-windows-x86_64 | NOTE |
| r-patched-linux-x86_64 | OK |
| r-release-linux-x86_64 | NOTE |
| r-release-macos-arm64 | NOTE |
| r-release-macos-x86_64 | NOTE |
| r-release-windows-x86_64 | NOTE |
Check details (9 non-OK)
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.
compiled code
File 'curl/libs/x64/curl.dll': Found non-API call to R: 'R_new_custom_connection' Compiled code should not call non-API entry points in R. See 'Writing portable packages' in the 'Writing R Extensions' manual.
installed package size
installed size is 9.0Mb
sub-directories of 1Mb or more:
doc 1.8Mb
libs 6.9Mb
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
tests
Running ‘spelling.R’ [0s/0s] Comparing ‘spelling.Rout’ to ‘spelling.Rout.save’ ...6c6 < NULL --- > All Done! Running ‘testthat.R’ [3s/109s]
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File 'curl/libs/x64/curl.dll': Found non-API call to R: 'R_new_custom_connection' Compiled code should not call non-API entry points in R. See 'Writing portable packages' in the 'Writing R Extensions' manual, and section 'Moving into C API compliance' for issues with the use of non-API entry points.
Check History
NOTE 6 OK · 8 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE Mar 31, 2026
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File 'curl/libs/x64/curl.dll': Found non-API call to R: 'R_new_custom_connection' Compiled code should not call non-API entry points in R. See 'Writing portable packages' in the 'Writing R Extensions' manual, and section 'Moving into C API compliance' for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.
installed package size
installed size is 9.0Mb
sub-directories of 1Mb or more:
doc 1.8Mb
libs 6.9Mb
ERROR 5 OK · 8 NOTE · 0 WARNING · 1 ERROR · 0 FAILURE Mar 27, 2026
whether package can be installed
Installation failed. See 'd:/Rcompile/CRANpkg/local/4.6/curl.Rcheck/00install.out' for details.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File 'curl/libs/x64/curl.dll': Found non-API call to R: 'R_new_custom_connection' Compiled code should not call non-API entry points in R. See 'Writing portable packages' in the 'Writing R Extensions' manual, and section 'Moving into C API compliance' for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.
installed package size
installed size is 9.0Mb
sub-directories of 1Mb or more:
doc 1.8Mb
libs 6.9Mb
NOTE 6 OK · 8 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE Mar 24, 2026
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File 'curl/libs/x64/curl.dll': Found non-API call to R: 'R_new_custom_connection' Compiled code should not call non-API entry points in R. See 'Writing portable packages' in the 'Writing R Extensions' manual, and section 'Moving into C API compliance' for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.
installed package size
installed size is 9.0Mb
sub-directories of 1Mb or more:
doc 1.8Mb
libs 6.9Mb
ERROR 6 OK · 7 NOTE · 0 WARNING · 1 ERROR · 0 FAILURE Mar 21, 2026
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File 'curl/libs/x64/curl.dll': Found non-API call to R: 'R_new_custom_connection' Compiled code should not call non-API entry points in R. See 'Writing portable packages' in the 'Writing R Extensions' manual, and section 'Moving into C API compliance' for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.
whether package can be installed
Installation failed. See 'd:/Rcompile/CRANpkg/local/4.4/curl.Rcheck/00install.out' for details.
NOTE 6 OK · 8 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE Mar 16, 2026
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File 'curl/libs/x64/curl.dll': Found non-API call to R: 'R_new_custom_connection' Compiled code should not call non-API entry points in R. See 'Writing portable packages' in the 'Writing R Extensions' manual, and section 'Moving into C API compliance' for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.
installed package size
installed size is 9.0Mb
sub-directories of 1Mb or more:
doc 1.8Mb
libs 6.9Mb
ERROR 5 OK · 8 NOTE · 0 WARNING · 1 ERROR · 0 FAILURE Mar 14, 2026
tests
Running ‘spelling.R’ [0s/1s] Running ‘testthat.R’ [0m/24m] Running the tests in ‘tests/testthat.R’ failed. Complete output: > library(testthat) > library(curl) Using libcurl 8.18.0 with OpenSSL/3.5.5 > > # Comply with CRAN policy: skip t ...[truncated]... est-progress.R:11:3'): callbacks are protected ─────────────────── Expected `total_handles()` to equal 0L. Differences: 1/1 mismatches [1] 4 - 0 == 4 [ FAIL 15 | WARN 6 | SKIP 6 | PASS 231 ] Error: ! Test failures. Execution halted
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File 'curl/libs/x64/curl.dll': Found non-API call to R: 'R_new_custom_connection' Compiled code should not call non-API entry points in R. See 'Writing portable packages' in the 'Writing R Extensions' manual, and section 'Moving into C API compliance' for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.
installed package size
installed size is 9.0Mb
sub-directories of 1Mb or more:
doc 1.8Mb
libs 6.9Mb
NOTE 6 OK · 8 NOTE · 0 WARNING · 0 ERROR · 0 FAILURE Mar 10, 2026
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual, and section ‘Moving into C API compliance’ for issues with the use of non-API entry points.
compiled code
File 'curl/libs/x64/curl.dll': Found non-API call to R: 'R_new_custom_connection' Compiled code should not call non-API entry points in R. See 'Writing portable packages' in the 'Writing R Extensions' manual, and section 'Moving into C API compliance' for issues with the use of non-API entry points.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.
compiled code
File ‘curl/libs/curl.so’: Found non-API call to R: ‘R_new_custom_connection’ Compiled code should not call non-API entry points in R. See ‘Writing portable packages’ in the ‘Writing R Extensions’ manual.
installed package size
installed size is 9.0Mb
sub-directories of 1Mb or more:
doc 1.8Mb
libs 6.9Mb