Suffixes containing special characters
You might see (or inherit responsibility for) older DOIs which contain other characters, and require special treatment in a URL:
- Encode hash or pound sign # as
%23 - Do not encode left bracket (or less than) < as
< and right bracket (or greater than) > as > when resolving DOIs or retrieving metadata from our REST API to retrieve the metadata (see below) - Do not encode forward slash / when resolving DOIs or retrieving metadata from our REST API
For example, use the following when resolving DOIs with special characters:
https://doi.org/10.1002/(SICI)1521-3951(199911)216:1<135::AID-PSSB135>3.0.CO;2-%23
instead of:
https://doi.org/10.1002/(SICI)1521-3951(199911)216:1<135::AID-PSSB135>3.0.CO;2-#
And, to retrieve the metadata in our REST API, using those same DOI examples use:
https://api.crossref.org/works/10.1002/(SICI)1521-3951(199911)216:1%3C135::AID-PSSB135%3E3.0.CO;2-%23
instead of:
https://api.crossref.org/works/10.1002/(SICI)1521-3951(199911)216:1<135::AID-PSSB135>3.0.CO;2-#
