I have tried a lot to connect to some other domain using backbone.js.
But couldn't be able to perform.
I tried to override sync method, even tried ajax call in backbone.js, tried java script also. but couldn't succeed.
I don't know how to proceed further. any help will be appreciable..
Seems like CORS problem, you could not sove this with client side only.
To test API CORS support you can use test CORS
So you can solve this by:
Implement CORS support on API server side.
Proxy requests from your app server side to API.
Use another techies to cross-origin policy like(JSONP, etc..)
Related
I'm a beginner learning node and angular but running into many issues. I have Angular running on Node, and my code in Angular makes http requests to retrieve json from an API on another web server (this web server is something I add routes to and I'm not allowed to enable CORS on it). I'm getting 'CORS blocked' due to my http request although I know this resource is accessible. I understand that you have to enable CORS in the web server but in this case that is not an option. There is another web app (not running on the same origin as the resource) that is doing a similar thing to mine but instead he uses node to retrieve the json data and then I think he sends that to angular to process. Is this a possible work around?
Yes it is. If you can't enable cors headers on the server then the only thing you can do is access the server from your nodejs or any other type of server. If you eventually plan to run your angular in cordova you could make a direct $http request because cordova does not block corsable requests.
I am using ejabberd as XMPP server,one of our project need to have a xmpp web client,for that i am referring Professional "XMPP Programming with JavaScript and jQuery" by jake moffitt i was going through chapter 3 hello world application ,here in order to make xmpp web client using strophe i have to include creating java script file such as strophe.js,flXHR.js,and strophe.flxhr.js
i have gone through example many time but failed to connect with the server,
when i checked bosh connection using localhost:5280/http-bind it is working fine!!!!!
with try and error when i try to connect with xmpp server with removing flXHR.js ,it magically got connected to xmpp server!!!!!
FLxhr.js is used for making cross domain call as per book" Flash has a strict security policy, but unlike JavaScript, it allows cross-domain
requests to be sent to domains that permit such requests."
If i bypass above FLxhr.js i have to use a proxies
i am using apache tomcat as web-app server ,i haven't setup any proxies and not included FLxhr.js file in my html page ,but still xmpp client is able to communicate with server!!
Can some one please explains me what is the reason behind this??
thanks in advance!!
It's likely that your XMPP server has CORS enabled, I know Openfire now supports this. With CORS, strophe.js is able to make a cross origin request without needing the workaround provided by flash(FLxhr.js), and also works without any server side redirects.
Cross-Origin Resource Sharing
Cross Domain AJAX for XMPP HTTP-Binding Made Easy
CORS Browser Support
If you want to quickly check to see if your XMPP server has CORS enabled, you should be able to locate a crossdomain.xml file hosted on the root of your server.
Example:
I connect Strophe to my XMPP server using the address http://192.168.0.26:7070/http-bind/.
Since I have CORS enabled, I can browse to http://192.168.0.26:7070/crossdomain.xml and the server will return an XML file.
I am writing an app that will send POST/GET requests from a remote client to a server. As a way to test and also educate myself I was trying to make these requests by writing a simple html file that resides on my desktop with a form that would POST to a server side php file. I also tried using ajax style requests or XMLHttprequests independent of and connected to a form but I received an error in the console:
Cross Origin Request Blocked
For all attempts form or no form. I have read that this is because I am making the request from FILE:// and this is not allowed by browsers unless CORS is enabled in some way. I have also read that using a webserver to host the file might fix the problem but I don't understand what is meant by webserver (separate or same domain? lamp, xammp, mamp?) and I am not interested in overriding security (allowing cors with headers) if I am eventually going to have to find a secure way when it goes live anyway.
As I said I am really just trying to test and I would like my html files to communicate with the server-side php from another machine instead of just putting all files together in the same domain/folder. Is there a way to do this using html/javascript or Websockets or anything html5 has to offer that might be useful?
code examples are welcome but if anyone could help me grasp this concept better it would be greatly appreciated. I am a noob XD
I am open to a better approach entirely if one exists, the only constraint I have is that everything on the UI/Client end is going to be written in html/javascript but I can utilize either or both intel XDK api and Cordova api as well.
Please help and thank you.
If you need to send some HTTP requests to test the server-side of your app I would strongly recommend you use an HTTP client like Fiddler:
http://www.telerik.com/fiddler
Also, read this:
GUI HTTP client
A desktop-based client will have a nice GUI with plenty of features to tweak, save, send, resend your requests.
One thing you can do is use pythons SimpleHTTPServer to serve the html file. Then when you go to your browser and go to 127.0.0.1:8000 the origin will be the same.
You can run the server by going into the directory that has the html file and running the command python -m SimpleHTTPServer 8000. This will serve the content of that directory on port 8000 and it should allow the requests to be made without a CORS exception.
Heres the documentation https://docs.python.org/2/library/simplehttpserver.html
I recommend that you disable the same-origin policy in your browser in order to test cross domain AJAX request from a local file.
For example, with Google Chrome on Windows you can disable this by launching chrome with the following command :
C:\Users\YOUR_USER\AppData\Local\Google\Chrome\Application\chrome.exe --allow-file-access-from-files --disable-web-security
Together, both of these flags will allow you to test cross-domain ajax requests from a local file. These flags are relevant across Mac, Windows and Linux.
This is not on how to write the requests but you can bypass writing those if you are using the latest version of the Intel XDK. If you go to the services tab in the latest version of the Intel XDK, there is a service by the name of Sandbox Explorer. It has a GET and POST method UI. Just plug in the URL and you will see the response immediately. You can use this to debug the server that you are writing. Once you have the server returning the right response, create a data binding to use the GET API in your client side javascript or html code. Cross origin is taken care of.
I am not familiar with this issue and I hope you can help.
I am developing a web application. My Backend api endpoints sits under http://www.example.com/api where my front end application located in http://www.otherdomain.com.
The problem is that I get cross domain problems when I am trying to make ajax requests.
I am using AngularJS in the frontend and RoR (rails) on the backend.
Do you have any idea how to fix it?
For security reasons browsers are blocking ajax request for another domain(you can read here). But you can try to use $http.jsonp()
We encountered this several times before in our PHP & Java Backend Api's. But our solution was always to include this to your api server header: Access-Control-Allow-Origin "*"
The best solution would probably be to set a reverse proxy using nginx so that the requests can be received by a local server, on your local domain, and reverse-proxied to the destination server exactly as they were received (CORS limitation do not apply on servers).
Another solution is this neat Javascript proxy:
https://github.com/jpillora/xdomain
Could ajax be used on the client side javascript to function as an in-the-background web spider? You'll have to excuse the vagueness of this post because I really have no idea where to begin technically in terms of the code and there is nothing online about a program like this.
You can use a cors proxy type script in order to do these Ajax requests client side via javascript. Look on Github for 'cors proxy', and set that up in your Node.js environment, then pass all of your ajax calls client side through this proxy.
Yes its possible but with some restrictions, meant only to be done from a specially-configured browser, not for arbitrary users to just run:
For chrome, open it using the command-line parameter --disable-web-security.
now you can do cross domain and such.
I assume you just want it for using yourself as a server and not on a public web page.
You cannot make ajax requests to different hosts, so no.