Update Chrome version in linkcheck user-agent (#2569)

CHANGELOG.md

@@ -9,6 +9,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 * The `User-Agent` header set in the linkcheck HTTP(S) requests can now be customized with the `linkcheck_useragent` option to `makedocs`. ([#2557], [#2562])
 
+### Changed
+
+* The default `User-Agent` header set in the linkcheck HTTP(S) requests now reports `Chrome/127.0.0.0` instead of `Chrome/51.0.2704.103`. This _may_ change how servers interpret the linkcheck requests, and cause previously passing checks to failing, but it is more likely to fix previous spurious failures. ([#2557], [#2569])
+
 ### Fixed
 
 * The paths for `size_threshold_ignore` option of `Documenter.HTML` are now correctly normalized and no longer sensitive to platform-dependent differences in path separators. ([#2560], [#2561])

src/docchecks.jl

@@ -191,7 +191,7 @@ function linkcheck(node::MarkdownAST.Node, element::MarkdownAST.AbstractElement,
  return nothing
 end
 
-const _LINKCHECK_DEFAULT_USERAGENT = "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36"
+const _LINKCHECK_DEFAULT_USERAGENT = "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36"
 
 function linkcheck(node::MarkdownAST.Node, link::MarkdownAST.Link, doc::Document; method::Symbol=:HEAD)
 

test/online_linkcheck.jl

@@ -16,6 +16,7 @@ using Test
  [FTP (no proto) success](ftp.iana.org/tz/data/etcetera)
  [Redirect success](google.com)
  [HEAD fail GET success](https://codecov.io/gh/invenia/LibPQ.jl)
+ [Linkcheck old Chrome UA fail](https://www.intel.com/content/www/us/en/developer/tools/oneapi/mpi-library.html)
  """
  )
  doc = Documenter.Document(; linkcheck=true, linkcheck_timeout=20)