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Checking signal abort status before doing anything else #106

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Checking signal abort status before doing anything else #106

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4 changes: 4 additions & 0 deletions src/fetch.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -64,6 +64,10 @@ export function fetchEventSource(input: RequestInfo, {
fetch: inputFetch,
...rest
}: FetchEventSourceInit) {
// Request leak if input signal aborted before the subscription even started.
if (inputSignal?.aborted) {
return;
}
return new Promise<void>((resolve, reject) => {
// make a copy of the input headers since we may modify it below:
const headers = { ...inputHeaders };
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