I have a spring web application that I start locally with th

Question

I have a spring web application that I start locally with these java proxy properties ``` Dhttp proxyHost=localhost Dhttp proxyPort=1080 Dhttp nonProxyHosts=``` I am starting a local WireMock server with http port 1080 The spring application is definitely routing requests through the designated proxy but my WireMock server is not forwarding these requests to their destination My goal is to have WireMock return stubs if there is a mapping match otherwise forward the request to its destination and log the forwarded request Is WireMock able to act as a proxy server in this way I am using `wiremock jre8 standalone` 2 35 0 The <https wiremock org docs proxying |WireMock Proxy docs> mentions a WireMockServer option `passThroughProxy Boolean ` which it says defaults to true which sounds exactly like what I want But I don t see this option available on this version of WireMock

Tom · Answer

Hi < Steve Teplica> provided you start WireMock with browser proxying which is just forward proxying enabled then it will behave in the way you re asking for To do this you either do ` enableBrowserProxying true ` in the Java startup options or ` enable browser proxying` from the CLI

Steve Teplica · Answer

It looks like HTTP requests are working fine with this setup Right now I m floundering with getting HTTPS requests working Changes to Spring Application I added these JVM proxy settings for HTTPS ``` Dhttps proxyHost=localhost Dhttps proxyPort=1083 Dhttps nonProxyHosts=``` Changes to WireMock Server I configured WireMock s HTTPS port to 1083 I added a `ConsoleNotifyingWiremockNetworkTrafficListener` to log info on incoming outgoing network traffic These are the current relevent WireMock configurations ```WireMockServer wireMockServer = new WireMockServer WireMockConfiguration options port 1080 httpsPort 1083 enableBrowserProxying true trustAllProxyTargets true preserveHostHeader true ``` Observed behavior It looks like the initial HTTP CONNECT request to open a tunnel to client s request destination is closing prematurely or failing ```2023 03 29 16 25 53 924 Opened Socket addr= 127 0 0 1 port=53213 localport=1083 2023 03 29 16 25 53 930 Incoming bytes CONNECT HTTP 1 1 Host Proxy Connection Keep Alive User Agent okhttp 3 8 1 2023 03 29 16 25 53 938 Outgoing bytes P 2023 03 29 16 25 53 943 Closed Socket unconnected ``` < Tom> Do you have any advice for debugging this further Or does this appear as an obvious symptom to you of something being misconfigured Any help is greatly appreciated smile

Steve Teplica · Answer

Extra context on the requested domain I obfuscated it as `<http subdomain domain com|subdomain domain com>` This is an endpoint that can only be reached while on my corporate network I m VPN d in The spring application normally sends these requests directly to that endpoint The spring application does have a keystore and a truststore I m not sure if how those should be used from WireMock

Steve Teplica · Answer

I found this bit on WireMock s proxying docs Sounds like this is exactly what I need to do in my situation Do you have an example of creating two separate HTTPS sessions for this configuration

Tom · Answer

You ll need to ensure that the Spring app trusts WireMock s CA certificate otherwise it ll correctly detect that it s doing an MITM attack and refuse to send traffic

Tom · Answer

This is documented here <https wiremock org docs proxying browser proxying of https>

Steve Teplica · Answer

Thanks Tom The cause of these SSL problems for me was how I configured the java proxy ports I stumbled across JvmProxyConfigurer in WireMock and saw that it sets `http proxyPort` and `https proxyPort` to the same port So I did the same thing for my spring app and then everything was working