How To Fix STW_OL309 - HTTP call failed, returning an empty body (status code &1)

SAP Error Message - Details

• Message type: E = Error

• Message class: STW_OL - Messages of the Object Layer (Stream Work Library)

• Message number: 309

• Message text: HTTP call failed, returning an empty body (status code &1)

What causes this issue?

An HTTP request has returned no result and reported status code
&syst-msgv1&.
This often happens if the service provider closes the connection too
early. This can be seen as a programming error on the service provider's
side.

System Response

The method in process is terminated.

How to fix this error?

If this happens the first time you try, try again.
If the error still occurs, contact the service provider to find out why
the result code &syst-msgv1& and an empty response body have been sent.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message STW_OL309 - HTTP call failed, returning an empty body (status code &1) ?

  The SAP error message STW_OL309 indicates that an HTTP call made by the SAP system has failed, resulting in an empty response body. The status code returned is specified in the error message (represented by &1). This error can occur in various scenarios, such as when integrating with external services or APIs.
  Causes:
  
  Network Issues: There may be connectivity problems between the SAP system and the external service.
  Service Unavailability: The external service might be down or not reachable at the moment.
  Incorrect URL: The URL being called may be incorrect or malformed.
  Authentication Issues: If the external service requires authentication, incorrect credentials or tokens may lead to a failed call.
  Timeouts: The request may be timing out due to slow response from the external service.
  Firewall or Proxy Issues: Network firewalls or proxy settings may be blocking the request.
  Service Configuration: The external service may not be configured to handle the request properly.
  
  Solutions:
  
  Check Network Connectivity: Ensure that the SAP system can reach the external service. You can use tools like ping or curl to test connectivity.
  Verify the URL: Double-check the URL being used in the HTTP call to ensure it is correct.
  Check Service Status: Verify if the external service is up and running. You can check the service's status page or contact the service provider.
  Review Authentication: If the service requires authentication, ensure that the credentials or tokens are correct and have not expired.
  Increase Timeout Settings: If timeouts are an issue, consider increasing the timeout settings for the HTTP call in the SAP configuration.
  Check Firewall/Proxy Settings: Ensure that there are no firewall or proxy settings blocking the request. Consult with your network administrator if necessary.
  Review Logs: Check the SAP application logs and the logs of the external service for any additional error messages that could provide more context.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to HTTP communication errors for any specific patches or updates that may address the issue.
  Transaction Codes: Use transaction codes like SICF to manage HTTP services in SAP and SMICM to monitor the Internet Communication Manager.
  Debugging: If you have access, consider debugging the HTTP call in the ABAP code to see the exact request being sent and the response received.
  
  If the issue persists after trying the above solutions, it may be beneficial to engage with SAP support or the support team of the external service for further assistance.