Top "Rfc" questions

An RFC is a "Request For Comments": the form of internet standards from the Internet Engineering Task Force (IETF) until they are made standards.

Are email addresses case sensitive?

I've read that by standard first part of e-mail is case sensitive, however I've tried to send e-mail to name@…

email smtp rfc
How to overcome root domain CNAME restrictions?

We are hosting many web applications for our customers. As is obvious they want to use their own domains to …

networking dns rfc cname
RegEx to parse or validate Base64 data

Is it possible to use a RegEx to validate, or sanitize Base64 data? That's the simple question, but the factors …

regex base64 standards-compliance rfc
TCP Sequence Number

I'm trying to understand how the sequence numbers of the TCP header are generated. In some places I read that …

tcp numbers sequence rfc
Why is form enctype=multipart/form-data required when uploading a file?

Why is <form enctype=multipart/form-data> required when uploading a file to a web-server?

html http file-upload specifications rfc
The date/time format used in HTTP headers

Which RFC describes the format used for date/time in the modern time HTTP headers, like "Last-Modified" and "If-Modified-Since", and …

php http date rfc
Regex for validating multiple E-Mail-Addresses

I got a Regex that validates my mail-addresses like this: ([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\.)+))([a-zA-Z]{2,4}|[0…

c# regex validation email rfc
What is the maximum length of a DNS name

I saw several mentions that the maximum string length of a DNS name (domain name) is 253 characters. Wikipedia seems to …

dns hostname rfc rfc1035
What characters can one use in a URL?

I have an application that takes all the parameters in the url like this: /category/subcategory/sub-subcategory. I want to …

url rfc