277. Manipulating Request Objects

Jul 21, 2026 05:59 · 2:32 · English · Whisper Turbo · 2 Enregistraments

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Lectura

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Inside of an intersetter,

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you can not only log data,

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you can also modify the request object.

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However,

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the request object itself is immutable.

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So you can't set request URL to a new URL.

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That will not work and you also get an error here.

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Instead, if you wanna modify the request,

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you have to create a new one,

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like modified request,

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sounds like a fitting name for the constant,

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where you call request clone.

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And inside of clone,

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you pass in a JavaScript object where you now can overwrite all the

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core things.

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You could set a new URL here,

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or you could add new headers.

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If you wanna keep the old headers,

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by the way, then you simply do that by using the request headers

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and calling append.

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or you add new params or whatever you want.

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Now I wanted to add a header here.

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So indeed I will access my headers and I will access the old headers on the

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original request object and then simply call append.

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And as you learned,

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this will return a new headers object where I then have all the old headers,

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but also the new headers.

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And these will then be set here as headers for this modified

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request.

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And here I'll have my auth key,

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let's say with XYZ as a value.

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Of course, this is just some made up header,

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which doesn't really do anything.

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And now the important thing here is I do not forward the

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original request,

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but my modified request.

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And that of course is a typical use case for an intersetter.

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You change the request and then you forward that modified request.

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And if you only wanted to append the off header for certain URLs,

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then you could use a if check with the request URL key,

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for example.

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Here,

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I will indeed log request URL so that we really see for which request the

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intersetter ran.

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And now let's go back and let's

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fetch some posts,

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for example.

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You see the URL is being logged.

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If we have a look at the network,

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fetch again.

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We inspect that request.

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You see that there on the request headers of XYZ

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was indeed added and we should see the same if I now add

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a post.

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There,

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if we have a look at the request headers,

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we also see this.

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So our intersetter is adding that for all outgoing requests

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and therefore intersetters are a super important and useful feature.

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