How do I get the value of a failed request in Dispatch?

StackOverflow https://stackoverflow.com/questions/14941462

  •  10-03-2022
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Question

When I make a request in Dispatch, I apply the Promise and get this:

Left(dispatch.StatusCode: Unexpected response status: 400)

How do I get the actual text of the response? I'm using Solr and it still returns valuable JSON with failed HTTP requests.

Was it helpful?

Solution

It looks like you've written something like the following:

Http(url OK as.String)

The OK is what's providing the simple error handling you see here. You can use > to get the results more directly. For example, if you write this:

Http(url("http://google.com/") OK as.String).either()

You'll get the following (at the moment, at least):

Left(dispatch.StatusCode: Unexpected response status: 301)

But if you make the following small change:

Http(url("http://google.com/") > as.String).either()

You get the full body of the redirect page:

res1: Either[Throwable,String] = 
Right(<HTML><HEAD><meta http-equiv="content-type" ...

If you want to do something fancier with the response, you can write your own asWhatever handler—see my answer here for a demonstration of how to get access to the headers as a map, for example.

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