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Can you kindly send us the URL(s) of the feed source(s)?

This is typically caused by a problem with the feed source not specifying permalinks for its feed items.

https://feeds.feedburner.com/CenterForBiologicalDiversityPressReleases

I think that’s what it is. The latest duplicates from the feed I’m having trouble with are

https://feedproxy.google.com/~r/CenterForBiologicalDiversityPressReleases/~3/REcQ0TisgN8/url

https://feedproxy.google.com/~r/CenterForBiologicalDiversityPressReleases/~3/atqQWWjz3yA/url

https://feedproxy.google.com/~r/CenterForBiologicalDiversityPressReleases/~3/SOPDTrPKUDQ/url

and there are a few more different links for the same item

Hi stevedavieseswr.

I understand that all these URLs point to the same article. This is because when you access it in the browser, it goes through 2 redirects: a 301 and a 302; the latest one redirects the browser to the actual article URL.

Unfortunately, without first going to each URL in the sequence it is not possible to normalize feedproxy.google.com URLs into their actual form. If you really need to do this, however, then read below to find out how.

includes/feed-importing.php uses the wprss_normalize_permalink() function to convert URLs into their unique, canonical forms. It is possible to hook into this function using a wprss_normalize_permalink filter. This filter will receive the permalink as it’s first and only parameter, and should return the normalized permalink. The lowest priority used by WP RSS Aggregator for these filters is 8, so you should add the filter with priority of 7. This is because the filter added by the system with priority 8 is made to process Google News URLs, such as the URL to which the response of the first request will redirect.

In the filter, you are going to have to process the permalink in order to normalize it. This is the tricky part. You are going to have to use PHP’s cURL library, or any other alternative, to make a request. Here’s a helpful article on how this can be done. After you receive the responce, you will have to get the Location header; it’s value should contain the URL that you need to return from the filter. To retrieve the header from the response you would need to use the CURLOPT_HEADER option.

I appreciate that this is no trivial task. However, this is currently the only way to achieve what you want, since the feed itself does not provide the URLs in the form you need.

I hope this helps.

Thank you for taking the time to respond. I confess, it’s more complicated than I’m probably able to handle, but I will give it a try at some point.

To the Internet Gods I say, “Can nothing be simple?”