When is url encoding necessary

This includes:. For example, the in a URL denotes a jump mark within a website. These characters are not reserved and have no predefined meaning for the URL. The non-reserved characters include:. There are many tools available on the Internet that can quickly and easily convert an invalid URL to a valid one. Manual URL encoding is still feasible for small websites. As long as a character is not being used for its reserved purpose, it has to be encoded. We'll dive a little deeper into requests and responses and what they comprise of after the preparations chapter.

How To Read This Guide? Back to Open Book Shelf. What is a URL? Introduction When you need to locate someone's home, you need their house address. We can break this URL into 5 parts: http : The scheme. Now let's take a look at an example. Query strings are great to pass in additional information to the server, however, there are some limits to the use of query strings: Query strings have a maximum length. Therefore, if you have a lot of data to pass on, you will not be able to do so with query strings.

For this reason, passing sensitive information like username or password to the server in this manner is not recommended. If you were to put an ampersand into one of those values, it would look like the separator between the end of a value and the beginning of the next key.

So for special characters like this, we use percent encoding so that we can be sure that the data is unambiguously encoded. The space character is excluded because significant spaces may disappear and insignificant spaces may be introduced when URI are transcribed or typeset or subjected to the treatment of word- processing programs.

Whitespace is also used to delimit URI in many contexts. Let's break down your question. Why do you need to encode URL? A URL is composed of only a limited number of characters and those are digits , letters A-Z, a-z , and a few special characters "-", ".

So does it mean that we cannot use any other character? The answer to this question is "YES". So if you want to transmit any character which is not a member of the above mentioned digits, letters, and special chars , then we need to encode them. Is this enough for URL encoding? No this is not enough, there's a lot about URL encoding but here, I'm not gonna make it a pretty big, boring technical answer. Well, you do so because every different browsers knows how the string that makes up the URL is encoded.

It could be latin-1 it could be unicode. It needs normalized to something that is understood universally. How are we doing? Please help us improve Stack Overflow. The encodeURI function encodes a URI by replacing each instance of certain characters by one, two, three, or four escape sequences representing the UTF-8 encoding of the character will only be four escape sequences for characters composed of two "surrogate" characters.

The following example shows all the parts that a URI "scheme" can possibly contain.