Do you have users in China? Or do you have your Web Gateway working as an open proxy on the internet?
It looks like a lot of malformed URLs and bad encoded charachters, possibly containing chinese characters. You could switch the log sources from UTF-8 encoded to ISO-8859-1. That should help Web Reporter digest the data, but won't reduce the errors.
No,we have only Indian users ...
Since so many errors are generating does it means that those logs will not be displayed on Quick view dashboard..
What Errors detected actually means & how logs will b affected in context of webreporter????
It seems that those requests are not valid HTML traffic, so they cannot be imported and wouldn't show up in your reports anyway. In many cases, the Web Gateway should be sending HTTP 500 errors to the client for them.
The errors are the number of log lines which could not be parsed. It could be due to wrong log format or log header mismatch, or invalid requests, etc. Looks like yours are due to invalid requests. You could just ignore them. It might be difficult building regex to ignore them.