fetch-api
Fetch local JSON file from public folder ReactJS
I think your fetch argument is wrong. It should be fetch(‘data/mato.json’)
How to get the filename from a file downloaded using JavaScript Fetch API?
So, shortly after posting this question, I ran across this issue on Github. It apparently has to do with using CORS. The suggested work around was adding Access-Control-Expose-Headers:Content-Disposition to the response header on the server. This worked!
Why does .json() return a promise, but not when it passes through .then()?
Why does response.json return a promise? Because you receive the response as soon as all headers have arrived. Calling .json() gets you another promise for the body of the http response that is yet to be loaded. See also Why is the response object from JavaScript fetch API a promise?. Why do I get the … Read more
Unable to fetch POST without no-cors in header
The custom Content-Type header you’re sending causes your request to be preflighted, which means an OPTIONS request, containing some metadata about the POST request that is about to be dispatched, will be sent before the actual POST request. Your server needs to be prepared to deal with this OPTIONS request. You haven’t specified what the … Read more
typescript Cannot add headers to a fetch api using react-native
Can you try typing it as HeadersInit? const requestHeaders: HeadersInit = new Headers(); requestHeaders.set(‘Content-Type’, ‘application/json’); const responseLogin = await fetch(‘URL’, { method: ‘POST’, headers: requestHeaders, body: requestBody }); If not, can you show the error you are getting when you are initiating it with the Headers() constructor, you showed in the question?
Reread a response body from JavaScript’s fetch
Use Response.clone() to clone Response let clone = response.clone(); Alternatively, use Response.body.getReader() which returns a ReadableStream to read Response as a stream, TextDecoder() to convert Uint8Array data stream to text.
Hide 401 console.error in chrome dev tools getting 401 on fetch() call [duplicate]
Unfortunately, this cannot be done, as this type of message in the console is printed by chrome itself. Repressing this type of message has been debated for years, but the consensus seems to be that this message is desirable – see this discussion. Just in case you’re interested: As per this comment, the reason we’re … Read more
TypeError: Failed to execute ‘fetch’ on ‘Window’: Invalid value
Double-check the value in your Authorization header for invalid characters: This also happened to me when I tried to add an Authorization header to my fetch calls, due to an invalid character in the Authorization key. In my case it was caused by a newline (\n) character in the header string, i.e. Bearer:\nsomelong-token. Changing the … Read more