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Intercepting API responses

junior_grossiposted in #help-playwright
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junior_grossi
junior_grossi

Hi, I'm basically testing APIs using the APIRequestContext. On every response I'd like to log the test name (available on testInfo) and a correlation ID I receive as a response header. I was thinking on overriding the request using fixtures and then listen to the response event, but there's no way to listen to when a response is received in API (like we have for Page -> page.on('response'). Any ideas?

This thread is trying to answer question "How can I intercept API responses using APIRequestContext and log test names and correlation IDs?"

7 replies
skorp32
skorp32

Use the same approach - fixtures and define page.on there.

skorp32
skorp32

However, it's just a listener and does not stop any execution so I would recomment try-catching the response.

junior_grossi
junior_grossi

thanks @skorp32 for your reply. I think the challenge is how to define page.on in there there? the implementation of those event listeners is not very straightforward it seems. maybe PW has an easier way to achieve that result?

.graff
.graff

Are you using apiRequest.newContext() or page.request / browserContext.request ? You won't have any events without a browser/page to have the events. Ad-hoc requests would need to be handled manually

skorp32
skorp32
someFixture: [
    async ({ page }, use) => {
      page.on('response', async response => {
        // do stuff with response
      })

      await use()
    },
    { auto: true },
  ],
skorp32
skorp32

that's an automatic one, but you can do same thing with simpel fixture as well

skorp32
skorp32

and as I mentioned, try-catch response body because on navigation (and perhaps other stuff) response bodies are dumped so you might get an error

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