Fixes #1894. Use requests session for keep-alive connections
Fixes #1894. Use requests session for keep-alive connections

data-exp-lab/girder,manthey/girder,kotfic/girder,RafaelPalomar/girder,adsorensen/girder,girder/girder,girder/girder,sutartmelson/girder,data-exp-lab/girder,Xarthisius/girder,Kitware/girder,kotfic/girder,girder/girder,Kitware/girder,kotfic/girder,RafaelPalomar/girder,jbeezley/girder,kotfic/girder,RafaelPalomar/girder,sutartmelson/girder,data-exp-lab/girder,data-exp-lab/girder,Xarthisius/girder,kotfic/girder,girder/girder,jbeezley/girder,jbeezley/girder,adsorensen/girder,adsorensen/girder,sutartmelson/girder,adsorensen/girder,sutartmelson/girder,manthey/girder,Xarthisius/girder,manthey/girder,jbeezley/girder,sutartmelson/girder,RafaelPalomar/girder,Xarthisius/girder,data-exp-lab/girder,Kitware/girder,manthey/girder,adsorensen/girder,Kitware/girder,RafaelPalomar/girder,Xarthisius/girder