HTTP POST with Json on Body - Flutter Dart

Question

This is my code to make a request to an API   import  dart async   import  dart convert   import  dart io   import  package http http dart  as http   Future lt http Response gt  postRequest    async     var url   https   pae ipportalegre pt testes2 wsjson api app ws-authenticate     var body   jsonEncode    data      apikey    12345678901234567890           print  Body      body      http post url        headers    Content-Type    application json          body  body     then  http Response response        print  Response status    response statusCode         print  Response body    response contentLength         print response headers       print response request                I have a problem with the response from the request  where its suppose to have a body with json  but something went wrong and i think is with the json that i send on the body request  because it is a nested json object  and the value of the key is a json object  i would love to know how i can parse the json right and insert into body of the request   this is the header response     set-cookie  JSESSIONID DA65FBCBA2796D173F8C8D78AD87F9AD path  testes2  HttpOnly  last-modified  Thu  10 May 2018 17 15 13 GMT  cache-control  no-store  no-cache  must-revalidate  max-age 0  post-check 0  pre-check 0  date  Thu  10 May 2018 17 15 13 GMT  content-length  0  pragma  no-cache  content-type  text html  server  Apache-Coyote 1 1  expires  Tue  03 Jul 2001 06 00 00 GMT    and this is how is suppose to be   Server  Apache-Coyote 1 1 Expires  Tue  03 Jul 2001 06 00 00 GMT Last-Modified  Thu  10 May 2018 17 17 07 GMT Cache-Control  no-store  no-cache  must-revalidate  max-age 0  post-check 0  pre-check 0 Pragma  no-cache Content-Type  application json charset UTF-8 Vary  Accept-Encoding Set-Cookie  JSESSIONID 84813CC68E0E8EA6021CB0B4C2F245BC path  testes2  HttpOnly Keep-Alive  timeout 5  max 100 Connection  Keep-Alive Transfer-Encoding  chunked   the body response came empty and i think its because the body i sent on the request  can anyone help me with the nested json object in value    SCREENSHOT OF POSTMAN

User · Answer

I implement like this   static createUserWithEmail String username  String email  String password  async      var url    http   www yourbackend com     users       var body              user                 username   username             address   email             password   password                      return http post        url         body  json encode body         headers             Content-Type    application json                 encoding  Encoding getByName  utf-8

User · Answer

This works   import  dart async   import  dart convert   import  dart io   import  package http http dart  as http   Future lt http Response gt  postRequest    async     var url   https   pae ipportalegre pt testes2 wsjson api app ws-authenticate      Map data          apikey    12345678901234567890          encode Map to JSON   var body   json encode data      var response   await http post url        headers    Content-Type    application json          body  body        print    response statusCode       print    response body       return response

User · Answer

this works for me String body   json encode data    http Response response   await http post    url   https   example com     headers    quot Content-Type quot    quot application json quot      body  body

User · Answer

In my case I forgot to enable app use express json      in my NodeJs server

User · Answer

This would also work    import  package http http dart  as http     sendRequest   async        Map data             apikey    12345678901234567890              var url    https   pae ipportalegre pt testes2 wsjson api app ws-authenticate       http post url  body  data           then  response          print  Response status    response statusCode           print  Response body    response body

User · Answer

This one is for using HTTPClient class   request headers add  body   json encode map      I attached the encoded json body data to the header and added to it  It works for me

User · Answer

OK  finally we have an answer     You are correctly specifying headers    Content-Type    application json    to set your content type  Under the hood either the package http or the lower level dart io HttpClient is changing this to application json  charset utf-8  However  your server web application obviously isn t expecting the suffix   To prove this I tried it in Java  with the two versions  conn setRequestProperty  content-type    application json  charset utf-8       fails conn setRequestProperty  content-type    application json       works   Are you able to contact the web application owner to explain their bug  I can t see where Dart is adding the suffix  but I ll look later   EDIT Later investigation shows that it s the http package that  while doing a lot of the grunt work for you  is adding the suffix that your server dislikes  If you can t get them to fix the server then you can by-pass http and use the dart io HttpClient directly  You end up with a bit of boilerplate which is normally handled for you by http   Working example below   import  dart convert   import  dart io   import  dart async    main   async     String url          https   pae ipportalegre pt testes2 wsjson api app ws-authenticate     Map map          data     apikey    12345678901234567890            print await apiRequest url  map       Future lt String gt  apiRequest String url  Map jsonMap  async     HttpClient httpClient   new HttpClient      HttpClientRequest request   await httpClient postUrl Uri parse url      request headers set  content-type    application json      request add utf8 encode json encode jsonMap       HttpClientResponse response   await request close         todo - you should check the response statusCode   String reply   await response transform utf8 decoder  join      httpClient close      return reply      Depending on your use case  it may be more efficient to re-use the HttpClient  rather than keep creating a new one for each request  Todo - add some error handling  -

User · Answer

I think many people have problems with Post  Content-type    application   json  The problem here is parse data Map  lt String  dynamic gt  to json   Hope the code below can help someone  Model   class ConversationReq     String name         String description         String privacy         String type         String status          String role    List lt String gt  members    String conversationType          ConversationReq  this type  this name  this status  this description  this privacy  this conversationType  this role  this members       Map lt String  dynamic gt  toJson          final Map lt String  dynamic gt  data   new Map lt String  dynamic gt          data  name     this name      data  description     this description      data  privacy     this privacy      data  type     this type       data  conversations                        members   members           conversationType   conversationType                      return data          Request   createNewConversation ConversationReq param  async       HeaderRequestAuth headerAuth   await getAuthHeader        var headerRequest   headerAuth toJson                      Content-type    application json                x-credential-session-token   xSectionToken               x-user-org-uuid   xOrg                      var bodyValue   param toJson         var bodydata   json encode bodyValue     important     print bodydata        final response   await http post env BASE API URL    xxx   headers  headerRequest  body  bodydata        print json decode response body        if  response statusCode    200             TODO       else            If that response was not OK  throw an error        throw Exception  Failed to load ConversationRepo

[json] HTTP POST with Json on Body - Flutter/Dart

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