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From: Andy Alness <andy@coinbase.com>
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Subject: [Bitcoin-development] Allow cross-site requests of payment requests
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--001a11c3db008b557b04f9298a03
Content-Type: text/plain; charset=UTF-8

Would it be a terrible idea to amend BIP 70 to suggest implementors include
a "Access-Control-Allow-Origin: *" response header for their payment
request responses? I don't think this opens up any useful attack vectors.

I ask because this would make it practical for pure HTML5 web wallets to
use the payment protocol entirely in-browser. Without this I think it would
be necessary for the server hosting the wallet's HTML to fetch payment
requests on the browser's behalf. This is somewhat inelegant and has
security/resource implications for the back-end.

-Andy

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Content-Type: text/html; charset=UTF-8
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<div dir=3D"ltr">Would it be a terrible idea to amend BIP 70 to suggest imp=
lementors include a &quot;Access-Control-Allow-Origin: *&quot; response hea=
der for their payment request responses? I don&#39;t think this opens up an=
y useful attack vectors.<div>
<br></div><div><div>I ask because this would make it practical for pure HTM=
L5 web wallets to use the payment protocol entirely in-browser. Without thi=
s I think it would be necessary for the server hosting the wallet&#39;s HTM=
L to fetch payment requests on the browser&#39;s behalf. This is somewhat i=
nelegant and has security/resource implications for the back-end.</div>

</div><div><br></div><div>-Andy</div><div>
</div></div>

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