Get content length in HTTP request appropriately when using Python 3.
Get content length in HTTP request appropriately when using Python 3.

sxds/opemmc,walshjon/openmc,paulromano/openmc,smharper/openmc,samuelshaner/openmc,smharper/openmc,johnnyliu27/openmc,walshjon/openmc,wbinventor/openmc,mjlong/openmc,wbinventor/openmc,kellyrowland/openmc,shenqicang/openmc,bhermanmit/openmc,shikhar413/openmc,mit-crpg/openmc,smharper/openmc,johnnyliu27/openmc,shikhar413/openmc,amandalund/openmc,mit-crpg/openmc,samuelshaner/openmc,sxds/opemmc,paulromano/openmc,amandalund/openmc,walshjon/openmc,wbinventor/openmc,liangjg/openmc,mit-crpg/openmc,paulromano/openmc,shenqicang/openmc,lilulu/openmc,lilulu/openmc,liangjg/openmc,nhorelik/openmc,bhermanmit/openmc,liangjg/openmc,shikhar413/openmc,kellyrowland/openmc,amandalund/openmc,samuelshaner/openmc,lilulu/openmc,shikhar413/openmc,wbinventor/openmc,nhorelik/openmc,mit-crpg/openmc,smharper/openmc,amandalund/openmc,mjlong/openmc,paulromano/openmc,liangjg/openmc,johnnyliu27/openmc,samuelshaner/openmc,johnnyliu27/openmc,walshjon/openmc