[Question] How to get POST response data using playwright mcp

[287611]

I want to get the response headers details for the page that in being navigated.
I can see a tool browser_network_requests, but will it give the details of response headers. Basically I want to get all the response headers for the pages that is being navigated.

In playwright, something like this can be used to get the response headers
page.on("response")

Wanted to check if there is similar implementation for playwright mcp

[Skn0tt]

Nope, there's nothing for that today. Should be trivial to add though, here's where we render the requests to the LLM:

playwright-mcp/src/tools/network.ts

Line 49 in 9066988

function renderRequest(request: playwright.Request, response: playwright.Response | null) {

Would you be interested in contributing a PR for this? I'm happy to review it, the key thing is that you play around with the string format to figure out what format the LLM likes.

[Skn0tt]

My main concern is if including all headers overloads the LLM with too much context. Some MCP clients are starting to implement support for MCP Resources, so maybe it'd also work to keep the browser_network_requests response small and then link to a resource that contains the entire request.

[287611]

Thanks @Skn0tt , adding response headers along with response status is straight forward. But as per your suggestion, to create new resource and a reference to the existing resource, I feel might take some time for me. But will try to add it

[Skn0tt]

Yeah, let me take back the resource suggestion. You'll have a hard time working on that. But if could look at improved formatting that solves the problem you have, that'd be fantabulous! Should be a change of a few lines only.

[287611]

Thanks @Skn0tt , for my usecase I need only custom response headers, is it fine if i pass that alone? In that case LLM won't be loaded with much context

[pavelfeldman]

I don't think we are ready to accept third party PR for this as we don't have a clear picture on how we'd like network resources to be represented.