Pass through SOAP proxy spring Unsupported media type multipart/related; type="application/xop+xml"; boundary - spring

Question

Hi I am trying to implement a pass through SOAP proxy via #RestController in spring. For this purpose I have mapped a rest controller in following way:
#RestController
class MyProxy {
#PostMapping(value = "/**")
public ResponseEntity<String> proxyPost(#RequestBody(required = false) String body, HttpServletRequest request) {}
}
The regular SOAP requests are going OK. The problem comes when a MTOM type of SOAP request is send via the proxy. Then spring failes with unrecognized content type. Here is the exception:
Caused by: org.springframework.web.multipart.MultipartException: Failed to parse multipart servlet request; nested exception is javax.servlet.ServletException: Unsupported Content-Type [multipart/related; type="application/xop+xml"; boundary="uuid:dacf4733-80b4-41bc-b2e1-db69b6beadf6"; start="<root.message#cxf.apache.org>"; start-info="text/xml"], expected [multipart/form-data]
at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.handleParseFailure(StandardMultipartHttpServletRequest.java:124)
at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.parseRequest(StandardMultipartHttpServletRequest.java:115)
at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.<init>(StandardMultipartHttpServletRequest.java:88)
at org.springframework.web.multipart.support.StandardServletMultipartResolver.resolveMultipart(StandardServletMultipartResolver.java:122)
at org.springframework.web.servlet.DispatcherServlet.checkMultipart(DispatcherServlet.java:1205)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1039)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
... 60 common frames omitted
Caused by: javax.servlet.ServletException: Unsupported Content-Type [multipart/related; type="application/xop+xml"; boundary="uuid:dacf4733-80b4-41bc-b2e1-db69b6beadf6"; start="<root.message#cxf.apache.org>"; start-info="text/xml"], expected [multipart/form-data]
at org.eclipse.jetty.server.Request.getParts(Request.java:2407)
at javax.servlet.http.HttpServletRequestWrapper.getParts(HttpServletRequestWrapper.java:317)
at org.springframework.web.multipart.support.StandardMultipartHttpServletRequest.parseRequest(StandardMultipartHttpServletRequest.java:95)
... 66 common frames omitted

Answer 1

When receiving a multipart/* request Spring delegates this to the configured Multipart handler. This is enabled by default and for this case should be disabled.
spring.servlet.multipart.enabled=false
Adding the above to your properties should disable it and prevent the parsing, so you can handle it in your controller.