I'm trying to let my visitors be able to post comments without visiting
anything on beta.blogger.com. I need to do this because I and most of
my visitors are not able to access this domain name from the Internet
connection we're using currently.

However, I can add a line of '72.14.219.190 beta.blogger.com' to
<WinDIR>System32\Drivers\etc\host to access beta.blogger.com directly.
But unfortunately, it's obviously not possible to ask all my visitors
to do so if they feel like to make comments to my blog.

I wrote a simple servlet and deployed it to my server, which hosts my
blog web pages. I made a form on the web pages to collect comments and
the data is POSTed to the servlet I made, which would start another
POST request to https://beta.blogger.com/comment.do, where Blogger Beta
receive comments posting.

I managed to add new comment entries and I did see them on Blogger
Beta's comment page located at
https://beta.blogger.com/comment.g?blogID=xxx&postID=xxx. I can even
read the redirected URL provided by https://beta.blogger.com/comment.do
and I can found the text "Your comment has been saved" from the HTML
codes I get from the redirected URL. but the problem is:

The post don't get rebuilt and the new comment entries won't be
displayed on my blog web pages.

If I POST the new comment directly to
https://beta.blogger.com/comment.do from my web page form, everything
is OK. However, as I said, I couldn't do so as my visitors are not able
to access beta.blogger.com directly.

Does anyone have any information about this problem? I'm very
appreciated for any suggestion or advice.

Thanks,

Whatever it is, if you add this field to your form, the new comment
entry should be POSTed correctly. Note that you may need to get this
token from the page whose post id is the same with the post you want to
comment.

My servlet would do this job automatically. Everytime before I make a
POST, I would fetch the comment.g page and parse this token, and then
submit it with all other params to comment.do.