Making authenticated POST requests with Spring RestTemplate for Android

Question

I have a RESTful API I m trying to connect with via Android and RestTemplate  All requests to the API are authenticated with HTTP Authentication  through setting the headers of the HttpEntity and then using RestTemplate s exchange   method   All GET requests work great this way  but I cannot figure out how to accomplish authenticated POST requests  postForObject and postForEntity handle POSTs  but have no easy way to set the Authentication headers   So for GETs  this works great   HttpAuthentication httpAuthentication   new HttpBasicAuthentication  username    password    HttpHeaders requestHeaders   new HttpHeaders    requestHeaders setAuthorization httpAuthentication    HttpEntity lt   gt  httpEntity   new HttpEntity lt Object gt  requestHeaders    MyModel   models   restTemplate exchange   api url   HttpMethod GET  httpEntity  MyModel   class     But POSTs apparently don t work with exchange   as it never sends the customized headers and I don t see how to set the request body using exchange     What is the easiest way to make authenticated POST requests from RestTemplate

User · Answer

Slightly different approach   MultiValueMap lt String  String gt  headers   new LinkedMultiValueMap lt String  String gt     headers add  HeaderName    value    headers add  Content-Type    application json     RestTemplate restTemplate   new RestTemplate    restTemplate getMessageConverters   add new MappingJackson2HttpMessageConverter      HttpEntity lt ObjectToPass gt  request   new HttpEntity lt ObjectToPass gt  objectToPass  headers    restTemplate postForObject url  request  ClassWhateverYourControllerReturns class

User · Answer

Ok found the answer  exchange   is the best way  Oddly the HttpEntity class doesn t have a setBody   method  it has getBody     but it is still possible to set the request body  via the constructor     Create the request body as a MultiValueMap MultiValueMap lt String  String gt  body   new LinkedMultiValueMap lt String  String gt           body add  quot field quot    quot value quot        Note the body object as first parameter  HttpEntity lt   gt  httpEntity   new HttpEntity lt Object gt  body  requestHeaders    ResponseEntity lt MyModel gt  response   restTemplate exchange  quot  api url quot   HttpMethod POST  httpEntity  MyModel class

User · Answer

I was recently dealing with an issue when I was trying to get past authentication while making a REST call from Java  and while the answers in this thread  and other threads  helped  there was still a bit of trial and error involved in getting it working   What worked for me was encoding credentials in Base64 and adding them as Basic Authorization headers  I then added them as an HttpEntity to restTemplate postForEntity  which gave me the response I needed   Here s the class I wrote for this in full  extending RestTemplate    public class AuthorizedRestTemplate extends RestTemplate       private String username      private String password       public AuthorizedRestTemplate String username  String password           this username   username          this password   password             public String getForObject String url  Object    urlVariables           return authorizedRestCall this  url  urlVariables              private String authorizedRestCall RestTemplate restTemplate               String url  Object    urlVariables           HttpEntity lt String gt  request   getRequest            ResponseEntity lt String gt  entity   restTemplate postForEntity url                   request  String class  urlVariables           return entity getBody               private HttpEntity lt String gt  getRequest            HttpHeaders headers   new HttpHeaders            headers add  Authorization    Basic     getBase64Credentials             return new HttpEntity lt String gt  headers              private String getBase64Credentials            String plainCreds   username         password          byte   plainCredsBytes   plainCreds getBytes            byte   base64CredsBytes   Base64 encodeBase64 plainCredsBytes           return new String base64CredsBytes

User · Answer

Very useful I had a slightly different scenario where I the request xml was itself the body of the POST and not a param  For that the following code can be used - Posting as an answer just in case anyone else having similar issue will benefit       final HttpHeaders headers   new HttpHeaders        headers add  header1    9998        headers add  username    xxxxx        headers add  password    xxxxx        headers add  header2    yyyyyy        headers add  header3    zzzzz        headers setContentType MediaType APPLICATION XML       headers setAccept Arrays asList MediaType APPLICATION XML        final HttpEntity lt MyXmlbeansRequestDocument gt  httpEntity   new HttpEntity lt MyXmlbeansRequestDocument gt               MyXmlbeansRequestDocument Factory parse request   headers       final ResponseEntity lt MyXmlbeansResponseDocument gt  responseEntity   restTemplate exchange url  HttpMethod POST  httpEntity MyXmlbeansResponseDocument class       log info responseEntity getBody

[java] Making authenticated POST requests with Spring RestTemplate for Android

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