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    <p>For encoding cookie values, you need to be careful. See this <a href="https://stackoverflow.com/questions/1693174/jboss-5-truncates-trailing-of-a-base64-cookie-string/1696756#1696756">older answer</a>:</p> <blockquote> <p>With Version 0 cookies, values should not contain white space, brackets, parentheses, <strong>equals signs</strong>, commas, double quotes, slashes, question marks, at signs, colons, and semicolons. Empty values may not behave the same way on all browsers.</p> </blockquote> <p>Base64 encoding can generate <code>=</code> symbols for certain inputs, and this technically is not permitted in cookies (version 0 cookies, anyway, which are the most widely supported). In practice, I suspect the <code>=</code> will actually work fine, but maybe not.</p> <p>I would suggest that to be absolutely sure that your encoded binary is cookie-compatible, then basic hex encoding is safest (e.g. <a href="http://commons.apache.org/codec/apidocs/org/apache/commons/codec/binary/Hex.html#encode(byte[])" rel="nofollow noreferrer">in java</a>).</p> <p><strong>edit:</strong> As @Paul helpfully pointed out, there is a <a href="http://en.wikipedia.org/wiki/Base64#URL%5Fapplications" rel="nofollow noreferrer">modified version of Base 64</a> that is "URL safe" (and, I assume, "cookie safe"). Using a modified version of a standard algorithm rather dilutes its charm, mind you.</p> <p><strong>edit</strong>: @shoosh pointed out that the <code>=</code> is only used to denote the end of the base64 string, so you could trim the <code>=</code>, set the cookie, then reattach the <code>=</code> again when you need to decode it.</p>
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    1. POWhat text encoding scheme do you use when you have binary data that you need to send over an ascii channel?
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    1. POWhat text encoding scheme do you use when you have binary data that you need to send over an ascii channel?
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    1. CO+1, nice warning about `=` character, ty
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      1. USRubens Farias
    2. COIn base64 the '=' is used only for padding the last bytes. You can either ensure that they are not emitted or just change them to something else (and then back again)
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      1. USshoosh
    3. COYou might want to consider updating your answer to refer to http://en.wikipedia.org/wiki/Base64#URL%5Fapplications - a version of Base4 specifically for use in the HTTP environment.
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      1. USPaul Wagland
 

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