| | |
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| | | node.removeChild(node.firstChild) |
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| | | } |
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| | | } |
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| | | |
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| | | // AliasRedirect emits HTML redirects which also have the link[rel="canonical"] |
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| | | // containing the URL it's redirecting to. |
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| | | // Extracting it here with regex is _probably_ faster than parsing the entire HTML |
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| | | // with a DOMParser effectively twice (here and later in the SPA code), even if |
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| | | // way less robust - we only care about our own generated redirects after all. |
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| | | const canonicalRegex = /<link rel="canonical" href="([^"]*)">/ |
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| | | |
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| | | export async function fetchCanonical(url: URL): Promise<Response> { |
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| | | const res = await fetch(`${url}`) |
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| | | if (!res.headers.get("content-type")?.startsWith("text/html")) { |
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| | | return res |
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| | | } |
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| | | // reading the body can only be done once, so we need to clone the response |
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| | | // to allow the caller to read it if it's was not a redirect |
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| | | const text = await res.clone().text() |
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| | | const [_, redirect] = text.match(canonicalRegex) ?? [] |
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| | | return redirect ? fetch(redirect) : res |
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| | | } |
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