Both validate_drp and validate_drp_gen3 are attempting to write NaN float values into JSON documents that are posted to SQuaSH. These NaNs violate the JSON standard. They are accepted by Python's JSON parser/writer due to a default flag argument that relaxes the standard. The requests package used to post the documents used to also permit this non-standard usage, but in 2.26.0, a change was made to disallow NaN (or +/-Inf).

Initially I thought this only affected validate_drp_gen3, which has other problems, so disabling that pipeline seemed like a relatively easy way out. But it turns out that validate_drp also has this problem.

Accordingly, until a fix can be made to lsst.verify (DM-31131), it seems best to pin requests to less than 2.26.0.