[Biopython] [Entrez] HTTPError 414

[c.buhtz at posteo.jp]

I create a "long" search term for Entrez.eSearch which results in an
URL 9998 characters long (search on 32 journals per ISSN).

Using this url (per copy and paste) in Firefox works without any
problems.

But using it with BioPython or more spcific urllib I get an HTTPError
414 back.

I am not sure but I think urllib itself doesn't check the URL-length.
It is the NCBI-server who throw back the 414.

But why does the server handle urllib and Firefox different?
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