[dba-Tech] Google Chrome: Error 'Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https, chrome-extension-resource.'

[Jim Lawrence]

Hi Shamil:

Oh dear... I had hoped that we were able to get away from all these browser disparities. 

I have run into this "cross domain" problem so many times. It is a fairly recent issue supposedly to guard against cross site attacks. It seems that each browser has it own interpretation of what represents a domain's range.

When you are running everything from Localhost domains are not a problem but when the site is moved to a webserver then how relative and absolute links are managed become an issue. Hard coding for internal links usually works but if an absolute link is built in code, like in a variable, then interpretation becomes browsers dependent. There is three ways around this; one, build all absolute links via server side code, two, use only relative links and three, assuming you have a server BE in place, use the server's configuration file to set the base parameters. 

My choice, as using the server to handle things that are really FE issues is a waste of resources, is to write all internal site code as relative links. In 2008, I had to completely rewrite the DBA sites code as that is when the browser change took place and I didn't want that little site to be server dependent.

Jim    

----- Original Message -----
From: "Salakhetdinov Shamil" <mcp2004 at mail.ru>
To: "Discussion of Hardware and Software issues" <dba-tech at databaseadvisors.com>
Sent: Saturday, June 6, 2015 9:39:30 AM
Subject: Re: [dba-Tech] Google Chrome: Error 'Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https, chrome-extension-resource.'

 Hi Jim --

As I have noted FireFox works well with the same html + js-es + json opened directly from local disk  using File -> Open.

Have a look:  http://tinyurl.com/oxpdbf6

But I wanted to have Google Chrome to be working as smoothly as FF (or Safari). I don't even mention IE... 

Thank you.

-- Shamil

Saturday, June  6, 2015 10:08 AM -06:00 from Jim Lawrence <accessd at shaw.ca>:
>Hi Shamil:
>
>When I run into similar problems it is because some of the required files or a library are not in the "path".
>
>Jim
>
>----- Original Message -----
>From: "Salakhetdinov Shamil" < mcp2004 at mail.ru >
>To: "Discussion of Hardware and Software issues" < dba-tech at databaseadvisors.com >
>Sent: Saturday, June 6, 2015 4:26:49 AM
>Subject: [dba-Tech] Google Chrome: Error 'Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https, chrome-extension-resource.'
>
> Hi All --
>
>I'm working through TypeScript EdX course using Sublime/Gulp and while working on/running this course Module 5 assessment html + js I'm getting the following errors:
>
>
>1. XMLHttpRequest cannot load file:///E:/Typescript/Learning/Module5/src/JSON/recipeTypes.json. 
>Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https, chrome-extension-resource.
>2. Uncaught NetworkError: Failed to execute 'send' on 'XMLHttpRequest': Failed to load 'file:///E:/Typescript/Learning/Module5/src/JSON/recipeTypes.json'. It's clear what the errors mean - what is unclear is how to make 'cross origin request' allowed for 'file:' protocol for Google Chrome -  a kind of local HTML app running without a web server?
>
>FYI: when opening the same assessment .html locally in FF 38.01. it works without any complains: .js executes, .json files loaded and parsed, drop-down boxes filled with data from .json files etc.
>
>Thank you.
>
>-- 
>Салахетдинов Шамиль
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