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I am using the javascript fetch API to query a cross-domain api using this code :
fetch('https://api.com/search?query="2016"').then(function (response) {
console.log(response.headers.get('Access-Control-Allow-Headers'))
console.log(response.headers.get('Content-Range'))
console.log(response.headers.get('Accept-Range'))
console.log(response.headers.get('Date'))
console.log(response.headers.get('Content-Type'))
})
The response headers are as follow :
Accept-Range:cars 300
Access-Control-Allow-Credentials:true
Access-Control-Allow-Headers:Origin, X-Requested-With, Content-Type, Accept, Content-Range, Accept-Range
Access-Control-Allow-Methods:PUT, POST, OPTIONS, GET
Access-Control-Allow-Origin:*
Cache-Control:no-cache
Connection:keep-alive
Content-Range:0-99/1941
Content-Type:application/json
Date:Tue, 12 Jan 2016 12:17:55 GMT
Transfer-Encoding:chunked
What is very strange is that only "Content-Type" is working for others i get null :
null
null
null
null
application/json
What do i need to do to retrieve those null headers ?
564
We then fetch this request using fetch() , extract a blob from the response using Response. blob , create an object URL out of it using URL. createObjectURL , and display this in an <img> . Note that at the top of the fetch() block, we log the response headers to the console.
Can I read response headers in JavaScript? While you can't ready any headers of HTML response in JS, you can read Server-Timing header, and you can pass arbitrary key-value data through it.
To view the request or response HTTP headers in Google Chrome, take the following steps : In Chrome, visit a URL, right click , select Inspect to open the developer tools. Select Network tab. Reload the page, select any HTTP request on the left panel, and the HTTP headers will be displayed on the right panel.
The Fetch API allows you to asynchronously request for a resource. Use the fetch() method to return a promise that resolves into a Response object. To get the actual data, you call one of the methods of the Response object e.g., text() or json() . These methods resolve into the actual data.
Damn i was using 'Access-Control-Allow-Headers' instead of 'Access-Control-Expose-Headers'
It works now
148
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