HTTP 301 302

No, they don't use files. When you click on a link like that, an HTTP request is send to their server with the full URL, like http://bit.ly/duSk8wK (links to this question). They read the path part (here duSk8wK), which maps to their database. In the database, they find a description (sometimes), your name (sometimes) and the real URL. Then they issue a redirect, which is a HTTP 302 response and the target URL in the header.

This direct redirect is important. If you were to use files or first load HTML and then redirect, the browser would add TinyUrl to the history, which is not what you want. Also, the site that is redirected to will see the referrer (the site that you originally come from) as being the site the TinyUrl link is on (i.e., twitter.com, your own site, wherever the link is). This is just as important, so that site owners can see where people are coming from. This too, would not work if a page gets loaded that redirects.

PS: there are more types of redirect. HTTP 301 means: redirect permanent. If that would happen, the browser will not request the bit.ly or TinyUrl site anymore and those sites want to count the hits. That's why HTTP 302 is used, which is a temporary redirect. The browser will ask TinyUrl.com or bit.ly each time again, which makes it possible to count the hits for you (some tiny url services offer this).

http://stackoverflow.com/questions/4025482/cant-escape-the-backslash-with-regex

Có 1 TH ntn:

Bên JS gọi api trả về url full ảnh vd: https://abc.def.com/upload/image1.jpg
Sau đó regex lấy cái TÊN ảnh only => image1.jpg

H muốn làm thao để sau khi qua regex mà vẫn được full URL ?
var photo = "https://api.abc.com/upload/image1.jpg";
var test = photo.split('/').pop();
console.log(test);

var test2 = test == '' || test == null ? test : photo;
console.log(test2);

test luôn lấy giá trị sau slash (/) cuối cùng.
Hàm pop sau split như sau: split() tách chuỗi thành array phân biệt bởi ký tự `/`. Hàm pop() lấy ra phần tử cuối trong mảng KQ.
=> https://api.abc.com/upload/image1.jpg sau split('/') => array(...)
pop() => thành image1.jpg

Bây  h muốn BYPASS (hay hack) mà sau khi split() vẫn trả về full url.
Lý do: Ví dụ bạn có 1 app js (ionic iOS chẳng hạn) mà đang có bug link ảnh sai. Version này cũ rồi có user rồi (user quan trọng) ko / khó bắt họ update.

=> Phải fix bên API, ko đc fix phía ionic js.
H hướng fix mình nghĩ có 2 cách:
1. tìm cách by pass spit('/') = 1 trick trong URL image api trả về.
2. Viết/use 1 url shortener => sau khi split() vẫn trả về 1 url shortened :) vẫn ok ?

=> Cách2 có vẻ kq hơn.
Nhưng shortener vẫn bi /
goo.gl?redirect=my_shortern_hash_