From RFC 5321, section 2.3.11: The standard mailbox naming convention is defined to be “local-part@domain”; contemporary usage permits a much broader set of applications than simple “user names”. Consequently, and due to a long history of problems when intermediate hosts have attempted to optimize transport by modifying them, the local-part MUST be interpreted and assigned … Read more
You are right The BOM character is illegal in JSON (and not needed) The MIME charset is illegal in JSON (and not needed as well) RFC 7159, Section 8.1: Implementations MUST NOT add a byte order mark to the beginning of a JSON text. This is put as clearly as it can be. This is … Read more
Let’s start with a simple example. Let’s say you have an email list, that is going to send out the following RFC2822 content. From: <[email protected]> To: <[email protected]> Subject: Super simple email Reply-To: <[email protected]> This is a very simple body. Now, let’s say you are going to send it from a mailing list, that implements VERP … Read more
Data URIs cannot be used for navigation, for scripting, or to populate frame or iframe elements in IE. According to http://msdn.microsoft.com/en-us/library/cc848897%28v=vs.85%29.aspx: Data URIs are supported only for the following elements and/or attributes. object (images only) img input type=image link CSS declarations that accept a URL, such as background, backgroundImage, and so on. Data URIs can … Read more
It has to do with how the browser packages binary and form data for transmission over HTTP. By default only form data is sent, but if the form needs to support uploading a file, then the binary data must also be appended and separated from the form data. Scott Hanselman gives a good explanation of … Read more
They are not forbidden, it’s CGI legacy. See “Missing (disappearing) HTTP Headers“. If you do not explicitly set underscores_in_headers on;, nginx will silently drop HTTP headers with underscores (which are perfectly valid according to the HTTP standard). This is done in order to prevent ambiguities when mapping headers to CGI variables, as both dashes and … Read more
From the RFC 4648: Base encoding of data is used in many situations to store or transfer data in environments that, perhaps for legacy reasons, are restricted to US-ASCII data. So it depends on the purpose of usage of the encoded data if the data should be considered as dangerous. But if you’re just looking … Read more