Daily problem essay | 21.11.29: use resttemplate to call external put request, and prompt '400 bad request'

Use resttemplate Call external put request , Tips ‘400 bad request’

Problem description ： Today, call external... Inside the project put type api The following error appears ：

I asked api Of url The address is the one with the parameter in the middle ：/a/b/{ Parameters }/c/{ Parameters 2}

The analysis should be that the parameter is not passed in the right way , Cause the error

Solution try

After searching the Internet for some related questions , Refer to the solutions of netizens , Try the following

Try -1： Use exchange Method

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);MultiValueMap<String, String> map= new LinkedMultiValueMap<String, String>();map.add(category_id,category_value);
MultiValueMap<String, String> map2= new LinkedMultiValueMap<String, String>();
map2.add("id",parent_id);
map2.add("category_id",category_id.split("_")[0]);
try{
    // encapsulation RestTemplate To tool class RestTemplateUtils
   ResponseEntity responseEntity = RestTemplateUtils.put("https://...../api/v1/nodes/{id}/categories/{category_id}/",headers, map,String.class,map2);
}catch (Exception e){
   log.error(e.getMessage());
}
//RestTemplate Tool class RestTemplateUtils Realization     /**
     * PUT Request call mode 
     * @param url  request URL
     * @param headers  Request header parameters 
     * @param requestBody  Request parameter body 
     * @param responseType  Return object type 
     * @param uriVariables URL The variables in the , And Map Medium key Corresponding 
     * @return ResponseEntity  Response object encapsulation class 
     */
    public static <T> ResponseEntity<T> put(String url, HttpHeaders headers, Object requestBody, Class<T> responseType, Map<String, ?> uriVariables) {
        HttpEntity<Object> requestEntity = new HttpEntity<Object>(requestBody, headers);
        return geTemplate().exchange(url, HttpMethod.PUT, requestEntity, responseType, uriVariables);
    }

The result of the attempt ： Still wrong

Try -2： Use put Method , Modify the method in the tool class to put Method

    /* 
	 * PUT Request call mode 
     * @param url  request URL
     * @param headers  Request header parameters 
     * @param requestBody  Request parameter body 
     * @param responseType  Return object type 
     * @param uriVariables URL The variables in the , And Map Medium key Corresponding 
     * @return ResponseEntity  Response object encapsulation class 
     */
    public static <T> ResponseEntity<T> put(String url, HttpHeaders headers, Object requestBody, Class<T> responseType, Map<String, ?> uriVariables) {
        HttpEntity<Object> requestEntity = new HttpEntity<Object>(requestBody, headers);
        geTemplate().put(url, requestEntity,uriVariables);        return null;    }

The result of the attempt ： Still failed

Try -3： After trying all kinds of methods on the Internet, it doesn't work , I use the following method modified by myself , Solve the problem successfully ！！！

Solution ： modify url The way of transmitting reference

// Before the change ：
ResponseEntity<String> responseEntity = RestTemplateUtils.put("https://...../api/v1/nodes/{id}/categories/{category_id}/",headers, map,String.class,map2);
// After the modification ：
ResponseEntity<String> responseEntity = RestTemplateUtils.put("https://...../api/v1/nodes/" + parent_id + "/categories/" + category_id.split("_")[0] + "/",headers,map,String.class,map2);
// That is, put the parameters directly into url in 

The result of the attempt ： The request is successful ！

The above is the solution to this problem , However, the problems of the program also vary according to the running environment , I hope it can be used as a reference for my friends who have the same problems ！

If you don't have any suggestions now , So as not to find a solution to the same problem in the future , I mean, Ho said , See you next time ！