This just moved from http to https, and they put a redirect in place, so pretty straightforward. Applied.
2018-10-01 Gerald Pfeifer <ger...@pfeifer.com> * doc/xml/manual/allocator.xml: Adjust link to "Reconsidering Custom Memory Allocation". Index: doc/xml/manual/allocator.xml =================================================================== --- doc/xml/manual/allocator.xml (revision 264760) +++ doc/xml/manual/allocator.xml (revision 264761) @@ -531,7 +531,7 @@ <biblioentry> <title> <link xmlns:xlink="http://www.w3.org/1999/xlink" - xlink:href="http://people.cs.umass.edu/~emery/pubs/berger-oopsla2002.pdf"> + xlink:href="https://people.cs.umass.edu/~emery/pubs/berger-oopsla2002.pdf"> Reconsidering Custom Memory Allocation </link> </title>