topic Error with tRestClient HTTP 503 in Talend Studio

Error with tRestClient HTTP 503

gins0402 — Fri, 02 Jan 2026 14:45:42 GMT

Hello everyone, I am fairly new to Talend. I am making API calls from SAP Concur, but after a short time (20min, 6h, very variable) the job reports me this error in component tRestClient:

'Exception in component tRESTClient (Copy_of_Extraction)

javax.ws.rs.ProcessingException: java.io.IOException: IOException invoking *URL API* : Unable to tunnel through proxy. Proxy returns "HTTP/1.1 503 Service Unavailable"'

Can you help me in any way? Thanks

Re: Error with tRestClient HTTP 503

Anonymous — Tue, 23 May 2023 01:48:04 GMT

Hello @Gianluca Surico ,

Do you use a proxy in your studio machine?

if yes, please try to add a Proxy bypass host of the SAP concur api host (e.g. api.sap.com) in the studio Preferences page(Window->Preferences ->General->Network Connections) as the below, then re-try the job?

Re: Error with tRestClient HTTP 503

gins0402 — Tue, 23 May 2023 07:42:36 GMT

Hi @Aiming Chen thank you for your reply.

I launch the jobs from TAC so I cannot set the proxy on my machine. I used the tSetProxy component before the tRESTClient, without which the job does not start.

Re: Error with tRestClient HTTP 503

Anonymous — Tue, 23 May 2023 08:10:29 GMT

Hello @Gianluca Surico ,

Then you can add in any endpoints host of the SAP concur api host (e.g. api.sap.com) you would like to skip the proxy

in tSetProxy component 'No Proxy for' value like