404 when accessing Tomcat with HttpUrlConnection, 200 from browser

Question

I am getting the weirdest Tomcat error. I have a web app running on my localhost at port 8080 using tomcat and everything appears to running great, no errors etc. However, when I try to access this web app from another app using the HttpURLConnection class, I am getting a 404 error. The weird part is, when I put the same URL in the browser it returns a 200 code and has a valid response. I have tried/checked the following from these posts : post1 and post2 - Setting the `User Agent` and `Accept` headers. - I have checked the response body (using `HttpURLConnection.getInputStream()` as well as `HttpURLConnection.getErrorStream()`, in the case that 404 was an improper return code) and am indeed getting a page not found response. - I have tried setting the `connection.setDoOutput()` to `true` and `false` but it has not helped. - Tried changing `localhost` to `127.0.0.1`. Some more information, I have looked at the `Tomcat` access logs, and it appears that the request is never hitting the…

Accepted Answer

So, by shutting down the Tomcat that runs from Eclipse and retrying the application and browser requests, we've figured out that some process is stealing your requests.

You can find the thief by running `netstat -nao | find "8080"` on Windows or `netstat -nap | grep 8080` on Linux. It should show a line with `LISTENING` and `127.0.0.1:8080` and next would be the process ID.

404 when accessing Tomcat with HttpUrlConnection, 200 from browser

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