How to replay a Puppeteer HTTPRequest?

user_4693790 0
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Using Puppeteer, I am able to intercept HTTPResponses and their HTTPRequests:

page.on("response", async response => {
    let request = response.request(); // Getting the response request
    let responseHeaders = response.headers(); // Check response headers
    response.buffer().then(buffer => {
         // Play with response content
     });
})

Depending on the response content, I need to send the request again like a fresh one and get its response buffer. Instantiating an identical and new request is a valid option.

I know I could use node-fetch as a last resort, but Puppeteer seems to have everything embedded to do it without adding packages.

Do you know how to achieve this?

puppeteer node.js javascript
1 Answers

You can use page.evaluate to send a post request using fetch API

await page.evaluate(() => {
    return fetch('url', {method: 'POST', body: 'test' }).then(res => res.json())
})

So then you can make a request after the requestfinished event fired.

page.setRequestInterception(true)
page.on('requestfinished', async (request: Request) => {
    let response = request.response()                   // Getting the response request
    let responseHeaders = response.headers()            // Check response headers
    let responseBuffer = await response.buffer()        // Get the buffer required
    let responseJSON = await response.json()            // Get parsed JSON body
    await page.evaluate(([headers, buffer, json]) => {  // Replay request with buffer received
        let someData1 = buffer.toString()               // Change buffer to string type
        let someData2 = headers['Content-Type']         // or maybe use some headers data
        let someData3 = json.properties.value           // or use response data object properties
                                                        // This fetch API below will do the rest
        return fetch('url', { method: 'POST', body: 'test' }).then(res => res.json())
    }, [responseHeaders, responseBuffer, responseJSON])
})
user_79655670
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