[Development] How can I use a proxy to push change to codereview.qt-project.org?

[Liang Jian]

    I used to be pushing changes to be code reviewed using the following
command:
    git push ssh://jianliang79@codereview.qt-project.org:29418/qt/qtbaseHEAD:ref/for/stable
    That works fine before, but today after I type the command there is not
any response for half an hour, I think this is due to network problem,
maybe due to the china's great firewall or something else. How can I use a
proxy to push change? Thanks
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