277. Manipulating Request Objects

Jul 21, 2026 05:59 · 2:32 · English · Whisper Turbo · 2 གསལ་བཤད་
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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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S… Speaker 2 (277. Manipulating Request Objects)
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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S… Speaker 2 (277. Manipulating Request Objects)
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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S… Speaker 2 (277. Manipulating Request Objects)
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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S… Speaker 2 (277. Manipulating Request Objects)
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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S… Speaker 2 (277. Manipulating Request Objects)
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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