[🐛 Bug]: Network interception freeze whole application for request when content-type = raw

[maciekpazola]

What happened?

After updating Selenium from version 4.23 to 4.24 or 4.25, I encountered an issue where I can no longer capture a specific request within the application. This request is responsible for sending a file to the backend with a content type set as raw.

Although I don't receive any exceptions from Selenium, the tests seem to freeze because selenium blocks the request from complete. Since I'm tracking network requests asynchronously, the test ultimately fails on a different assertion.

The same scenarios works correctly manually and on 4.23 selenium version.
Issue appear appear both on chrome and edge.

request as curl:
curl "http://t1.vie1qacl113/theservice/v0001/restun/UploadSessionAppendChunkRaw" ^ -H "Accept: application/json, text/plain, */*" ^ -H "Accept-Language: en" ^ -H "Authorization: [TokenValue]" ^ -H "Connection: keep-alive" ^ -H "Content-Type: raw" ^ -H "Cookie: MixedSecurity._strReturnUrl=/Client/WEB/Main.aspx; ASP.NET_SessionId=olgs43wzcg3mh1vhgzrbcsbz" ^ -H "Origin: http://t1.vie1qacl113" ^ -H "Referer: http://t1.vie1qacl113/tdwv/" ^ -H "TenantName: t1" ^ -H "The-Client-Type: 19" ^ -H "The-Timezone-IANA: Europe/Vienna" ^ -H "User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36" ^ -H "X-The-UploadSession-ChunkPosition: 0" ^ -H "X-The-UploadSession-Id: 664ca222-888c-4ca1-9f52-46af77b82adb" ^ --data-raw [File Content]

How can we reproduce the issue?

Intercept traffic in application and then try to catch a request which send a file as raw.

Relevant log output

I've not found any logs in logtype.browser or driver on minimum log level trace

Operating System

win 11

Selenium version

.net 4.24

What are the browser(s) and version(s) where you see this issue?

Chrome 129

What are the browser driver(s) and version(s) where you see this issue?

Using newest drivers with seleniumdrivermanager

Are you using Selenium Grid?

No response

[github-actions]

@maciekpazola, thank you for creating this issue. We will troubleshoot it as soon as we can.

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Thank you!

[nvborisenko]

Let's compare internal selenium logs and try to find out any difference: https://www.selenium.dev/documentation/webdriver/troubleshooting/logging/

[maciekpazola]

Let's compare internal selenium logs and try to find out any difference: https://www.selenium.dev/documentation/webdriver/troubleshooting/logging/

The main difference I noticed is that in version 4.24, there are multiple 404 error logs:

TRACE HttpCommandExecutor: << StatusCode: 404, ReasonPhrase: 'Not Found', Version: 1.1, Content: System.Net.Http.StreamContent, Headers:
{
  Cache-Control: no-cache
  Content-Length: 1073
  Content-Type: application/json; charset=utf-8
}

Logs:
SeleniumLog_Selenium4.23_Passing.txt
SeleniumLog_Selenium4.24_Failing.txt

[nvborisenko]

Nothing interesting in logs, I guess 404 is side effect caused by incorrect network interception.

What I can propose:

• Selenium team will add more internal logging around CDP commands
• You can try to capture all CDP interactions via try { // execute your network continuation here } catch(Exception ex) { // capture it somewhere, to console? }. All event handlers are invoked like "fire and forget", probably introducing try/catch block we will see something useful.