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Groups > comp.lang.javascript > #36660

throw error in fetch with response text

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With this

fetch(url)
.then (function(response) {
   let contentType = response.headers.get("content-type");
   if (contentType && contentType.indexOf("text/html") !== -1) {
     throw response.text();
   } else {
     return response.blob();
   }
})
.then (blob => window.URL.createObjectURL(blob))
.then (ourl => {
   // do stuff
})
.catch(function(error) {
   window.alert(err);
});

when there's an error the server returns some text describing the error 
(instead of a blob when there's no error).

The alert though only displays [object Promise]. How do I get the 
'PromiseValue' text into the alert?

Andrew Poulos

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throw error in fetch with response text Andrew Poulos <ap_prog@hotmail.com> - 2019-05-29 10:23 +1000
  Re: throw error in fetch with response text Andrew Poulos <ap_prog@hotmail.com> - 2019-05-29 10:33 +1000

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