I'm trying to load a cross-domain HTML page using AJAX but unless the dataType is "jsonp" I can't get a response. However using jsonp the browser is expecting a script mime type but is receiving "text/html".
My code for the request is:
$.ajax({
type: "GET",
url: "http://saskatchewan.univ-ubs.fr:8080/SASStoredProcess/do?_username=DARTIES3-2012&_password=P#ssw0rd&_program=%2FUtilisateurs%2FDARTIES3-2012%2FMon+dossier%2Fanalyse_dc&annee=2012&ind=V&_action=execute",
dataType: "jsonp",
}).success( function( data ) {
$( 'div.ajax-field' ).html( data );
});
Is there any way of avoiding using jsonp for the request? I've already tried using the crossDomain parameter but it didn't work.
If not is there any way of receiving the html content in jsonp? Currently the console is saying "unexpected <" in the jsonp reply.
jQuery Ajax Notes
Due to browser security restrictions, most Ajax requests are subject to the same origin policy; the request can not successfully retrieve data from a different domain, subdomain, port, or protocol.
Script and JSONP requests are not subject to the same origin policy restrictions.
There are some ways to overcome the cross-domain barrier:
CORS Proxy Alternatives
Ways to circumvent the same-origin policy
Breaking The Cross Domain Barrier
There are some plugins that help with cross-domain requests:
Cross Domain AJAX Request with YQL and jQuery
Cross-domain requests with jQuery.ajax
Heads up!
The best way to overcome this problem, is by creating your own proxy in the back-end, so that your proxy will point to the services in other domains, because in the back-end not exists the same origin policy restriction. But if you can't do that in back-end, then pay attention to the following tips.
**Warning!**
Using third-party proxies is not a secure practice, because they can keep track of your data, so it can be used with public information, but never with private data.
The code examples shown below use jQuery.get() and jQuery.getJSON(), both are shorthand methods of jQuery.ajax()
CORS Anywhere
2021 Update
Public demo server (cors-anywhere.herokuapp.com) will be very limited by January 2021, 31st
The demo server of CORS Anywhere (cors-anywhere.herokuapp.com) is meant to be a demo of this project. But abuse has become so common that the platform where the demo is hosted (Heroku) has asked me to shut down the server, despite efforts to counter the abuse. Downtime becomes increasingly frequent due to abuse and its popularity.
To counter this, I will make the following changes:
The rate limit will decrease from 200 per hour to 50 per hour.
By January 31st, 2021, cors-anywhere.herokuapp.com will stop serving as an open proxy.
From February 1st. 2021, cors-anywhere.herokuapp.com will only serve requests after the visitor has completed a challenge: The user (developer) must visit a page at cors-anywhere.herokuapp.com to temporarily unlock the demo for their browser. This allows developers to try out the functionality, to help with deciding on self-hosting or looking for alternatives.
CORS Anywhere is a node.js proxy which adds CORS headers to the proxied request.
To use the API, just prefix the URL with the API URL. (Supports https: see github repository)
If you want to automatically enable cross-domain requests when needed, use the following snippet:
$.ajaxPrefilter( function (options) {
if (options.crossDomain && jQuery.support.cors) {
var http = (window.location.protocol === 'http:' ? 'http:' : 'https:');
options.url = http + '//cors-anywhere.herokuapp.com/' + options.url;
//options.url = "http://cors.corsproxy.io/url=" + options.url;
}
});
$.get(
'http://en.wikipedia.org/wiki/Cross-origin_resource_sharing',
function (response) {
console.log("> ", response);
$("#viewer").html(response);
});
Whatever Origin
Whatever Origin is a cross domain jsonp access. This is an open source alternative to anyorigin.com.
To fetch the data from google.com, you can use this snippet:
// It is good specify the charset you expect.
// You can use the charset you want instead of utf-8.
// See details for scriptCharset and contentType options:
// http://api.jquery.com/jQuery.ajax/#jQuery-ajax-settings
$.ajaxSetup({
scriptCharset: "utf-8", //or "ISO-8859-1"
contentType: "application/json; charset=utf-8"
});
$.getJSON('http://whateverorigin.org/get?url=' +
encodeURIComponent('http://google.com') + '&callback=?',
function (data) {
console.log("> ", data);
//If the expected response is text/plain
$("#viewer").html(data.contents);
//If the expected response is JSON
//var response = $.parseJSON(data.contents);
});
CORS Proxy
CORS Proxy is a simple node.js proxy to enable CORS request for any website.
It allows javascript code on your site to access resources on other domains that would normally be blocked due to the same-origin policy.
CORS-Proxy gr2m (archived)
CORS-Proxy rmadhuram
How does it work?
CORS Proxy takes advantage of Cross-Origin Resource Sharing, which is a feature that was added along with HTML 5. Servers can specify that they want browsers to allow other websites to request resources they host. CORS Proxy is simply an HTTP Proxy that adds a header to responses saying "anyone can request this".
This is another way to achieve the goal (see www.corsproxy.com). All you have to do is strip http:// and www. from the URL being proxied, and prepend the URL with www.corsproxy.com/
$.get(
'http://www.corsproxy.com/' +
'en.wikipedia.org/wiki/Cross-origin_resource_sharing',
function (response) {
console.log("> ", response);
$("#viewer").html(response);
});
The http://www.corsproxy.com/ domain now appears to be an unsafe/suspicious site. NOT RECOMMENDED TO USE.
CORS proxy browser
Recently I found this one, it involves various security oriented Cross Origin Remote Sharing utilities. But it is a black-box with Flash as backend.
You can see it in action here: CORS proxy browser
Get the source code on GitHub: koto/cors-proxy-browser
You can use Ajax-cross-origin a jQuery plugin.
With this plugin you use jQuery.ajax() cross domain. It uses Google services to achieve this:
The AJAX Cross Origin plugin use Google Apps Script as a proxy jSON
getter where jSONP is not implemented. When you set the crossOrigin
option to true, the plugin replace the original url with the Google
Apps Script address and send it as encoded url parameter. The Google
Apps Script use Google Servers resources to get the remote data, and
return it back to the client as JSONP.
It is very simple to use:
$.ajax({
crossOrigin: true,
url: url,
success: function(data) {
console.log(data);
}
});
You can read more here:
http://www.ajax-cross-origin.com/
If the external site doesn't support JSONP or CORS, your only option is to use a proxy.
Build a script on your server that requests that content, then use jQuery ajax to hit the script on your server.
Just put this in the header of your PHP Page and it ill work without API:
header('Access-Control-Allow-Origin: *'); //allow everybody
or
header('Access-Control-Allow-Origin: http://codesheet.org'); //allow just one domain
or
$http_origin = $_SERVER['HTTP_ORIGIN']; //allow multiple domains
$allowed_domains = array(
'http://codesheet.org',
'http://stackoverflow.com'
);
if (in_array($http_origin, $allowed_domains))
{
header("Access-Control-Allow-Origin: $http_origin");
}
I'm posting this in case someone faces the same problem I am facing right now. I've got a Zebra thermal printer, equipped with the ZebraNet print server, which offers a HTML-based user interface for editing multiple settings, seeing the printer's current status, etc. I need to get the status of the printer, which is displayed in one of those html pages, offered by the ZebraNet server and, for example, alert() a message to the user in the browser. This means that I have to get that html page in Javascript first. Although the printer is within the LAN of the user's PC, that Same Origin Policy is still staying firmly in my way. I tried JSONP, but the server returns html and I haven't found a way to modify its functionality (if I could, I would have already set the magic header Access-control-allow-origin: *). So I decided to write a small console app in C#. It has to be run as Admin to work properly, otherwise it trolls :D an exception. Here is some code:
// Create a listener.
HttpListener listener = new HttpListener();
// Add the prefixes.
//foreach (string s in prefixes)
//{
// listener.Prefixes.Add(s);
//}
listener.Prefixes.Add("http://*:1234/"); // accept connections from everywhere,
//because the printer is accessible only within the LAN (no portforwarding)
listener.Start();
Console.WriteLine("Listening...");
// Note: The GetContext method blocks while waiting for a request.
HttpListenerContext context;
string urlForRequest = "";
HttpWebRequest requestForPage = null;
HttpWebResponse responseForPage = null;
string responseForPageAsString = "";
while (true)
{
context = listener.GetContext();
HttpListenerRequest request = context.Request;
urlForRequest = request.RawUrl.Substring(1, request.RawUrl.Length - 1); // remove the slash, which separates the portNumber from the arg sent
Console.WriteLine(urlForRequest);
//Request for the html page:
requestForPage = (HttpWebRequest)WebRequest.Create(urlForRequest);
responseForPage = (HttpWebResponse)requestForPage.GetResponse();
responseForPageAsString = new StreamReader(responseForPage.GetResponseStream()).ReadToEnd();
// Obtain a response object.
HttpListenerResponse response = context.Response;
// Send back the response.
byte[] buffer = System.Text.Encoding.UTF8.GetBytes(responseForPageAsString);
// Get a response stream and write the response to it.
response.ContentLength64 = buffer.Length;
response.AddHeader("Access-Control-Allow-Origin", "*"); // the magic header in action ;-D
System.IO.Stream output = response.OutputStream;
output.Write(buffer, 0, buffer.Length);
// You must close the output stream.
output.Close();
//listener.Stop();
All the user needs to do is run that console app as Admin. I know it is way too ... frustrating and complicated, but it is sort of a workaround to the Domain Policy problem in case you cannot modify the server in any way.
edit: from js I make a simple ajax call:
$.ajax({
type: 'POST',
url: 'http://LAN_IP:1234/http://google.com',
success: function (data) {
console.log("Success: " + data);
},
error: function (e) {
alert("Error: " + e);
console.log("Error: " + e);
}
});
The html of the requested page is returned and stored in the data variable.
To get the data form external site by passing using a local proxy as suggested by jherax you can create a php page that fetches the content for you from respective external url and than send a get request to that php page.
var req = new XMLHttpRequest();
req.open('GET', 'http://localhost/get_url_content.php',false);
if(req.status == 200) {
alert(req.responseText);
}
as a php proxy you can use https://github.com/cowboy/php-simple-proxy
Your URL doesn't work these days, but your code can be updated with this working solution:
var url = "http://saskatchewan.univ-ubs.fr:8080/SASStoredProcess/do?_username=DARTIES3-2012&_password=P#ssw0rd&_program=%2FUtilisateurs%2FDARTIES3-2012%2FMon+dossier%2Fanalyse_dc&annee=2012&ind=V&_action=execute";
url = 'https://google.com'; // TEST URL
$.get("https://images"+~~(Math.random()*33)+"-focus-opensocial.googleusercontent.com/gadgets/proxy?container=none&url=" + encodeURI(url), function(data) {
$('div.ajax-field').html(data);
});
<div class="ajax-field"></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
You need CORS proxy which proxies your request from your browser to requested service with appropriate CORS headers. List of such services are in code snippet below. You can also run provided code snippet to see ping to such services from your location.
$('li').each(function() {
var self = this;
ping($(this).text()).then(function(delta) {
console.log($(self).text(), delta, ' ms');
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdn.rawgit.com/jdfreder/pingjs/c2190a3649759f2bd8569a72ae2b597b2546c871/ping.js"></script>
<ul>
<li>https://crossorigin.me/</li>
<li>https://cors-anywhere.herokuapp.com/</li>
<li>http://cors.io/</li>
<li>https://cors.5apps.com/?uri=</li>
<li>http://whateverorigin.org/get?url=</li>
<li>https://anyorigin.com/get?url=</li>
<li>http://corsproxy.nodester.com/?src=</li>
<li>https://jsonp.afeld.me/?url=</li>
<li>http://benalman.com/code/projects/php-simple-proxy/ba-simple-proxy.php?url=</li>
</ul>
Figured it out.
Used this instead.
$('.div_class').load('http://en.wikipedia.org/wiki/Cross-origin_resource_sharing #toctitle');
I have a site hosted on https:// in which I want to pull data from the site which shows the properties of the shares. The URL which returns the data is:
http://ir1.euroinvestor.com/asp/ir/xmlirmultiiso2.aspx?companyid=281191
The code which I have developed to get the data is as follows:
function GetSharesUpdate(){
// makeing AJAX calls to the web service for getting the share update
var xhr = new XMLHttpRequest(); // Set up xhr request
xhr.open("GET", "http://ir1.euroinvestor.com/asp/ir/xmlirmultiiso2.aspx?companyid=281191", true); // Open the request
xhr.responseType = ""; // Set the type of response expected
xhr.send();
// Asynchronously wait for the data to return
xhr.onreadystatechange = function () {
if (xhr.readyState == xhr.DONE) {
var tempoutput = xhr.responseXML;
alert(tempoutput);
}
}
// Report errors if they happen
xhr.addEventListener("error", function (e) {
console.error("Error: " + e + " Could not load url.");
}, false);
}
I am getting the error on the statement xhr.send(); which is as below:
Mixed Content: The page at 'https://[SiteUrl]' was loaded over HTTPS,
but requested an insecure XMLHttpRequest endpoint
'http://ir1.euroinvestor.com/asp/ir/xmlirmultiiso2.aspx?companyid=281191'.
This request has been blocked; the content must be served over HTTPS.
If I change the URL to https i.e.
https://ir1.euroinvestor.com/asp/ir/xmlirmultiiso2.aspx?companyid=281191
then xhr.send(); is executed without any error but I am getting xhr.responseXML null.
What should I make changes in my code to make it working?
The first problem is you are doing ajax request to non-https domain but your domain has SSL installed.
The second problem is Cross origin request CORS, you will have this problem even you solve first (ie. even you try ajax request from non-http domain).
Since you are requesting data from another website this is most likely to happen unless the requested server is configured to serve requests for you domain
To solve this you need to call the data from your server(proxy server) or have the requested server configured to allow requests from your domain.
See more - https://developer.mozilla.org/en-US/docs/Web/HTTP/Access_control_CORS
So I've been trying to access the twitch.tv api but every time i go to make a request i keep on getting the error:
"XMLHttpRequest cannot load https://api.twitch.tv/kraken/streams/normalice. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://127.0.0.1:8080' is therefore not allowed access."
I'm currently using the live-server package during the development process other wise I'm just using html, css, javascript. Here is my javascript:
var req = new XMLHttpRequest();
var url = 'https://api.twitch.tv/kraken/streams/normalice';
req.open("GET", url, true);
req.send();
req.onreadystatechange = function () {
if (req.status == 200 && req.readState == 4){
// do stuff here
console.log('hurray it worked');
}else{
console.log(req.statusText);
console.log(req.responseText);
}
}
Does anyone have any ideas as to why am I encountering this error?
The Twitch.tv API doesn't support CORS. You need to use JSON-P (aka JSONP) to work around it. Read more about that in the Twitch.tv API docs. There is a prior answer on how to make a JSONP request with native JavaScript that may be useful.
I'm trying to make the a great wifi chip (esp8266) to communicate with a HTML webpage.
Therefore I make use of XMLHttpRequest. I know that I have to set the Access-Control-Allow-Origin to let it work..
I still get the error in the console:
XMLHttpRequest cannot load http://x.x.x.x:8000/. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'null' is therefore not allowed access.
So the wifi module is sending this header:
WIFI MODULE RESPONSE
HTTP/1.1 200 OK\r\n
Access-Control-Allow-Origin: *\r\n
Content-Type: text/html\r\n
Hello world!\r\n
Then I'm trying to acces it with the webpage:
JAVASCIPT
var xmlhttp;
function loadXMLDoc(){
xmlhttp=new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
console.log("readystate " + xmlhttp.readyState);
console.log("status " + xmlhttp.status);
console.log(xmlhttp.getAllResponseHeaders());
console.log(xmlhttp.responseText);
if (xmlhttp.readyState==4 && xmlhttp.status==200){
console.log(xmlhttp.responseText);
//document.getElementById("myDiv").innerHTML=xmlhttp.responseText;
}
}
xmlhttp.open("GET","http://192.168.1.101:8000",true);
xmlhttp.send();
//console.log("status " + xmlhttp.status);
}
function send() {
xmlhttp.send("jooooo");
}
loadXMLDoc();
Sorry but it's not possible to give an example, because it's running locally.
Maybe someone can give me a debug method?
Update
I'm able to watch the headers in Chrome. The \r\n is displayed in the header. I can send a 200 or 404 status. But now I have to find out how to send the return statement.
View HTTP headers in Google Chrome?
So in my chrome console I get the header:
"200 OK\r\n\r\nOrigin: test\r\nAccess-Control-Allow-Origin: *\r\n\r\nContent-Type: text/html\r\n\r\nHello world!\r\n\r\n"
With a normal page I see 200 OK. So the \r\n is not working.... I have to find out how to send the return statement. When I set the 200 to a 404, I get a page not found. So the first part is received...
Ok, I removed the \r\n chars.
I just send the headers with the serial communication separate.
I succeed in sending:
HTTP/1.1 200 OK
Access-Control-Allow-Origin: *
Content-Type: text/html
And the response will be loaded in the javascript..
I tried to manage editing the template but I'm still not able to send email, I'm creating an subscription box, here's my code so far:
var x= document.getElementById("emailtxt").value;
var uploadFormData = new FormData();
uploadFormData.append("email", x);
var xhr = new XMLHttpRequest();
xhr.open('POST', 'http://realfashionstreet.com/Emailme.php',true);
xhr.onload=function() {
alert(this.status);
if(this.status==200) {
console.log('data sent');
alert(xhr.responseText);
} else {
//alert(this.status);
alert('Something Went Wrong, Try Again Later!');
}
};
/*xhr.addEventListener("load", function () {
document.getElementById('skm_LockPane').className= 'LockOff';
}, false);*/
xhr.send(uploadFormData);
return false;
}
Here's the box I'm getting :
http://realfashionstreet.com
It's just not showing any error or any response and also not sending email, but I think that site template doesn't allow to use php files if anyone have any other idea on how to send email using javascript…
Thanks
You can't for security reasons. See the same origin policy for JavaScript.
There are some workarounds that exploit browser bugs or corner cases, but using them is not recommended.
The best approach is having a server-side proxy that receives Ajax requests, and in turn, sends HTTP requests to other servers. This should be carefully implemented by sanitizing input and whitelisting the types of requests that are sent, and the servers that are contacted.
You're missing the www. in the request, this is causing a cross domain policy violation. This is the error I see in the console.
XMLHttpRequest cannot load http://realfashionstreet.com/Emailme.php. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://www.realfashionstreet.com' is therefore not allowed access. Default.asp:1
Ensure the URLs for the page and the XHR request have the exact same domains. Including subdomains like www