Controller return http url for php application

[plane11]

I have two application.
One is PHP(http://11.11.11.11/index.php?route=catalog/common) application, and the other is Spring MVC(http://12.12.12.12/sample) application.

if PHP send post data to MVC and MVC get data successfully.
i want send data to PHP with post, not get.

I was wondering what should be implemented in any way.

This is controller.

1. return with redirect
but, data is appended URL. (http://12.12.12.12?route=catalog/com...Millis=111111&....)

@RequestMapping("test.do")
public String test(@RequestParam(value = "test") String test,
			@RequestParam(value = "returnUrl") String returnUrl, Model model) {
	Map resultMap = custonService.test(test);

	model.addAttribute("currentTimeMillis",	resultMap.get("currentTimeMillis"));
	model.addAttribute("currentDate", resultMap.get("currentDate"));
	model.addAttribute("returnInputParam", resultMap.get("returnInputParam"));

	return "redirect:" + returnUrl;
}

2. return redirect with RedirectView
but, i can't varified any data from post or get.

@RequestMapping("test.do")
public ModelAndView test(@RequestParam(value = "test") String test,
			@RequestParam(value = "returnUrl") String returnUrl) {
	ModelAndView modelAndView = new ModelAndView();
	modelAndView.getModel().put("currentTimeMillis", resultMap.get("currentTimeMillis"));
	modelAndView.getModel().put("currentDate", resultMap.get("currentDate"));
	modelAndView.getModel().put("returnInputParam", resultMap.get("returnInputParam"));

	RedirectView rv = new RedirectView(returnUrl);
	rv.setExposeModelAttributes(false);
	modelAndView.setView(rv);

	return modelAndView;
}

3. return with forward
i got 404 error with url with like this : /sample/http:/12.12.12.12/index.php
missing ?route=catalog/common.

@RequestMapping("test.do")
public String test(@RequestParam(value = "test") String test,
			@RequestParam(value = "returnUrl") String returnUrl, Model model) {
	Map resultMap = custonService.test(test);

	model.addAttribute("currentTimeMillis", resultMap.get("currentTimeMillis"));
	model.addAttribute("currentDate", resultMap.get("currentDate"));
	model.addAttribute("returnInputParam", resultMap.get("returnInputParam"));

	return "forward:" + returnUrl;
}