Hi, can I get started this issue?

comment #2: Sure.  I think the original reporter realized they shouldn't be manually adding If-None-Match or If-Modified-Since headers and should instead let Cronet's cache control these headers.  Cronet should at least not crash in these cases.  I think in the past another Cronet user got a redirect response code from a broken server that forgot to include the Location header; again this should not crash Cronet.