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wgetのpostのパラメータでurlを渡す

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様々な理由でwgetのpostのパラメータとして、urlを渡したい時はあるけど、&のエスケープは気をつけないといけない.

たとえば、{a: 1, b: 2}というパラメータを渡したいなら

wget --post-data="a=1&b=2" http://hogehoge.com/fuga/piyo

となるが、{url: "http://example.com/?a=1&b=2"}みたいなのを渡したい時は
&をescapeしてあげないといけない

escapeするには%26を使う。

wget --post-data="url=http://example.com/?a=1%26b=2" http://hogehoge.com/fuga/piyo
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