presto-proxy/src/main/java/io/prestosql/proxy/ProxyResource.java/ProxyResource/postStatement
class ProxyResource:    @POST
    @Path("/v1/statement")
    @Produces(APPLICATION_JSON)
    public void postStatement(
            String statement,
            @Context HttpServletRequest servletRequest,
            @Context UriInfo uriInfo,
            @Suspended AsyncResponse asyncResponse)
    {
        Request.Builder request = preparePost()
                .setUri(uriBuilderFrom(remoteUri).replacePath("/v1/statement").build())
                .setBodyGenerator(createStaticBodyGenerator(statement, UTF_8));

        performRequest(servletRequest, asyncResponse, request, response -> buildResponse(uriInfo, response));
    }