URL string format:
https://idmapping.uniprot.org/cgi-bin/idmapping_http_client3?from=IDTYPE&to=IDTYPE[&taxid=TAXID][&async=YES|NO]&ids=ID1,ID2,...,IDn
where 'n' can be any number,
default async=YES, case insentive,
spaces may also be used as delimiters for ids, unless the ids are GeneNames.

URL examples:

https://idmapping.uniprot.org/cgi-bin/idmapping_http_client3?async=NO&from=PIR&to=ID&ids=CCHU,A28153

https://idmapping.uniprot.org/cgi-bin/idmapping_http_client3?async=NO&from=PIR&to=ACC&ids=CCHU,A28153

https://idmapping.uniprot.org/cgi-bin/idmapping_http_client3?async=NO&from=ACC&to=P_REFSEQ_AC&ids=Q65PH2,Q81VZ2,Q15796

https://idmapping.uniprot.org/cgi-bin/idmapping_http_client3?async=YES&from=GENENAME&to=ACC&ids=ALB,gene 12,gene 36

https://idmapping.uniprot.org/cgi-bin/idmapping_http_client3?async=NO&FROM=ID&to=GENENAME&ids=1A15_ARATH,002R_IIV3