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17 changes: 14 additions & 3 deletions packages/opentelemetry-instrumentation-fetch/src/fetch.ts
Original file line number Diff line number Diff line change
Expand Up @@ -32,7 +32,17 @@ import { VERSION } from './version';
// hard to say how long it should really wait, seems like 300ms is
// safe enough
const OBSERVER_WAIT_TIME_MS = 300;
const urlNormalizingA = document.createElement('a');

// Used to normalize relative URLs
let a: HTMLAnchorElement | undefined;
const getUrlNormalizingAnchor = () => {
if (!a) {
a = document.createElement('a');
}

return a;
};

/**
* FetchPlugin Config
*/
Expand Down Expand Up @@ -359,11 +369,12 @@ export class FetchInstrumentation extends InstrumentationBase<

const observer: PerformanceObserver = new PerformanceObserver(list => {
const perfObsEntries = list.getEntries() as PerformanceResourceTiming[];
urlNormalizingA.href = spanUrl;
const urlNormalizingAnchor = getUrlNormalizingAnchor();
urlNormalizingAnchor.href = spanUrl;
perfObsEntries.forEach(entry => {
if (
entry.initiatorType === 'fetch' &&
entry.name === urlNormalizingA.href
entry.name === urlNormalizingAnchor.href
) {
entries.push(entry);
}
Expand Down
14 changes: 11 additions & 3 deletions packages/opentelemetry-web/src/utils.ts
Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,14 @@ import {
import { HttpAttribute } from '@opentelemetry/semantic-conventions';

// Used to normalize relative URLs
const urlNormalizingA = document.createElement('a');
let a: HTMLAnchorElement | undefined;
const getUrlNormalizingAnchor = () => {
if (!a) {
a = document.createElement('a');
}

return a;
};

/**
* Helper function to be able to use enum as typed key in type and in interface when using forEach
Expand Down Expand Up @@ -125,8 +132,9 @@ export function getResource(
initiatorType?: string
): PerformanceResourceTimingInfo {
// de-relativize the URL before usage (does no harm to absolute URLs)
urlNormalizingA.href = spanUrl;
spanUrl = urlNormalizingA.href;
const urlNormalizingAnchor = getUrlNormalizingAnchor();
urlNormalizingAnchor.href = spanUrl;
spanUrl = urlNormalizingAnchor.href;

const filteredResources = filterResourcesForSpan(
spanUrl,
Expand Down