@alanorth The current implementation

So the effective Queries called in the search are e.g.

• https://api.crossref.org/works?query=10.1108/CAER-03-2020-0040
• https://api.crossref.org/works/?query=https://doi.org/10.1108/CAER-03-2020-0040
  containing in total the million records.

Reproduced on todays sandbox:

Also searching after the title is possible.

@floriangantner Ah I see! It's hard to imagine this free-text search being useful. Returning more than a single page of results—leave alone millions!—is a terrible user experience. Unless there's some way to make that free-text search more useful, I would say that we should make this explicitly use DOIs because that will return an exact match and is more likely the workflow that submitters will be using (at least at our institute, where our submitters are cataloging a journal article authored by one of our scientists).

I'd blame DoiCheck:

The crossrefimport explicitly checks if a DOI is given or not and only searches by query if no DOI is provided:

However only an extremely limited set of prefixes is recognized by isDoi:

so that https://doi.org/10.1108/CAER-03-2020-0040 is used with a query parameter and not as an ID.

We ran into the same problem a while ago and added a few more valid prefixes. Some of them very legacy:

private static final List<String> DOI_PREFIXES = Arrays.asList(
            "http://dx.doi.org/",
            "https://dx.doi.org/",
            "http://www-dx.doi.org/",
            "https://www-dx.doi.org/",
            "http://doi.org/",
            "https://doi.org/",
            "dx.doi.org/",
            "www.dx.doi.org/",
            "doi:");

@hutattedonmyarm Wow yes this is very simple and obviously correct. While there doesn't seem to be a single canonical form for DOIs, I think it has become more common to use the https://doi.org/10.xxxx/xxxxx URI format in the last few years. In our repository I have begun normalizing all DOIs to that format upon deposit. For one data point, Crossref at least recommends this since 2017.

Could you submit a patch with your additions?