zarr-python
Zarr's package split keeps producing standalone tools: a server, now a lazy indexer.
Comparison · DevOps
httpuv vs withr
A side-by-side editorial comparison of httpuv and withr — release velocity, themes, recent moves, and the top alternatives to consider.
Shared themes:maintenance
httpuv vs withr: at a glance
What is httpuv?
httpuv ships almost nothing, which is what you want from the web server under Shiny
httpuv is the C++ HTTP and WebSocket server that Shiny runs on. Across this window it added exactly one user-facing function - runStaticServer() for serving a directory - and spent every other release on race conditions, compiler and linker changes, CRAN check warnings, and mime type table updates.
What is withr?
withr rebuilt defer() on base R's own on.exit(), and got much faster for it
withr provides the with_ and local_ functions that temporarily change global state and restore it on exit - the cleanup primitive under most of the tidyverse test suites. Version 3.0.0 reimplemented defer() as a thin wrapper over base::on.exit(), which the maintainers made possible by contributing the required arguments to R 3.5 itself. Everything since has been small correctness work.
httpuv vs withr: editorial side-by-side
httpuv
0.0DEVOPS
httpuv ships almost nothing, which is what you want from the web server under Shiny
◆ Current state
httpuv is the C++ HTTP and WebSocket server that Shiny runs on. Across this window it added exactly one user-facing function - runStaticServer() for serving a directory - and spent every other release on race conditions, compiler and linker changes, CRAN check warnings, and mime type table updates.
◆ Where it's heading
There is no direction here in the usual sense, and that is the honest read: the package is a stable foundation whose releases are triggered by the toolchain moving, by R-devel warnings, or by a threading bug surfacing under load. The one recurring theme with substance is connection reliability - WebSocket keepalive pings, race conditions in the I/O thread - which is what actually breaks Shiny apps in production.
◆ Prediction
Expect continued small releases tracking Rtools, R-devel and mime data, with any substantive change most likely coming from a threading or WebSocket issue reported by Shiny users rather than from planned work.
withr
0.0DEVOPS
withr rebuilt defer() on base R's own on.exit(), and got much faster for it
◆ Current state
withr provides the with_ and local_ functions that temporarily change global state and restore it on exit - the cleanup primitive under most of the tidyverse test suites. Version 3.0.0 reimplemented defer() as a thin wrapper over base::on.exit(), which the maintainers made possible by contributing the required arguments to R 3.5 itself. Everything since has been small correctness work.
◆ Where it's heading
The arc here is a package pushing its own machinery down into base R and then living off the result. Once defer() became on.exit(), the remaining work is about where cleanup is allowed to happen - knitr documents, source() calls, the global environment, session end - and about restoring state correctly when an expression exits early. Releases are now infrequent and CRAN-driven.
◆ Prediction
Expect continued low-volume releases fixing edge cases in where deferred handlers run; with the core delegated to base R, there is little left that would prompt a larger change.
Alternatives to httpuv and withr
Other DevOps products tracked by Sparkpulse, ranked by recent ship velocity. Each card links to a full editorial trajectory and lets you pivot into a head-to-head comparison with either httpuv or withr.
ellipsis
ellipsis' checks live in rlang now; the package is a compatibility shim.
clock
clock is turning calendar conventions lubridate hard-coded into parameterized types.
promises
promises drops R6 for plain environments and wires async work into OpenTelemetry
htmltools
htmltools spends three releases walking back its own fill-layout opinions
xml2
xml2 relicensed to MIT, then moved its hot accessors from S3 into C
See all httpuv alternatives → · See all withr alternatives →
Recent activity from httpuv and withr
Latest ship moves from both products, interleaved chronologically. ⚡ = editorial spark.
- 1mo agowithrlocal_seed() actually preserves the seed now
- 1y agohttpuvServes .wasm as application/wasm; mime table refreshed
- 1y agowithrlocal_language() no longer warns when set to C
- 2y agohttpuvrunStaticServer() survives a failed browser launch
- 2y agohttpuvRtools build file update and macOS zlib linking fix
- 2y agowithrdefer() becomes a thin wrapper over base::on.exit() ⚡
- 2y agohttpuvFixes an R CMD check warning on error format strings
- 2y agohttpuvrunStaticServer() serves a directory of static files
- 3y agohttpuvFixes a race condition introduced in 1.6.10
- 4y agowithrCleanup works inside Rmd and source(); with_() gains a getter
- 4y agowithrNew maintainer; handlers run at session end
- 5y agowithrlocal_options() can set NULL; with_seed() controls RNG kind
Frequently asked questions
What is the difference between httpuv and withr?
Both compete on the same themes — maintenance — within DevOps. httpuv and withr are shipping at a similar cadence (velocity 0.0 vs 0.0, both within Sparkpulse's "active" band). See the at-a-glance table above for a side-by-side breakdown of velocity, recent sparks, and editorial themes.
Is httpuv better than withr?
Sparkpulse doesn't pick a winner — we score release velocity, not feature parity. httpuv and withr are shipping at a similar cadence (velocity 0.0 vs 0.0, both within Sparkpulse's "active" band). For your specific use case, the alternatives sections above list other DevOps products to evaluate alongside.
What are the best alternatives to httpuv?
Top httpuv alternatives in DevOps are ranked by recent ship velocity. Browse the "httpuv alternatives" section above for the current picks, or visit /alternatives/httpuv for the full list with editorial commentary on each.
What are the best alternatives to withr?
Top withr alternatives in DevOps are ranked by recent ship velocity. Browse the "withr alternatives" section above for the current picks, or visit /alternatives/withr for the full list with editorial commentary on each.