How to correctly set Http Request Header in Angular 2

Question

I have an Ionic 2 application using Angular 2  which is sending an Http PUT to a ASP NET Core API server  Here s the method I m using to send the request   public update student  Student   Promise lt Student gt        let headers   new Headers        headers append  Content-Type    application json        headers append  authentication      student token          const url      this studentsUrl         return this http          put url  JSON stringify student     headers  headers             toPromise            then      gt  student           catch this handleError       I m setting an authentication key value on the headers object   But when I receive this request on the server  I cannot find the authentication key on the header     As you can see in the picture  there are many keys on the header  but not the content and authentication keys that I manually added to the header in the client application   What am I doing wrong

User · Answer

We can do it nicely using Interceptors  You dont have to set   options in all your services neither manage all your error responses    just define 2 interceptors  one to do something before sending the   request to server and one to do something before sending the server s   response to your service     Define an AuthInterceptor class to do something before sending the request to the server  You can set the api token  retrieve it from localStorage  see step 4  and other options in this class  Define an responseInterceptor class to do something before sending the server response to your service  httpClient   You can manage your server response  the most comon use is to check if the user s token is valid  if not clear token from localStorage and redirect to login   In your app module import HTTP INTERCEPTORS from   angular common http   Then add to your providers the interceptors  AuthInterceptor and responseInterceptor   Doing this your app will consider the interceptors in all our httpClient calls  At login http response  use http service   save the token at localStorage  Then use httpClient for all your apirest services    You can check some good practices on my github proyect here

User · Answer

Your parameter for the request options in http put   should actually be of type RequestOptions  Try something like this   let headers   new Headers    headers append  Content-Type    application json    headers append  authentication      student token      let options   new RequestOptions   headers  headers     return this http      put url  JSON stringify student   options

User · Answer

For us we used a solution like this   this http get this urls order     amp list             headers                 Cache-Control    no-cache                    subscribe  response    gt          Reference here

User · Answer

You have a typo    Change  headers append  authentication     student token     To  headers append  Authentication   student token    NOTE the Authentication is capitalized

User · Answer

This should be easily resolved by importing headers from Angular   import   Http  Headers   from   angular http

User · Answer

The simpler and current approach for adding header to a single request is     Step 1 const yourHeader  HttpHeaders   new HttpHeaders       Authorization   Bearer JWT-token          POST request this http post url  body    headers  yourHeader         GET request this http get url    headers  yourHeader

User · Answer

Angular 4    You can either choose to set the headers manually  or make an HTTP interceptor that automatically sets header s  every time a request is being made     Manually  Setting a header   http    post   api items add   body        headers  new HttpHeaders   set  Authorization    my-auth-token            subscribe      Setting headers   this http  post  api items add   body      headers  new HttpHeaders        Authorization    my-auth-token        x-header    x-value          subscribe     Local variable  immutable instantiate again   let headers   new HttpHeaders   set  header-name    header-value    headers   headers set  header-name-2    header-value-2     this http    post  api items add   body    headers  headers       subscribe        The HttpHeaders class is immutable  so every set   returns a new instance and applies the changes    From the Angular docs     HTTP interceptor     A major feature of  angular common http is interception  the ability to declare interceptors which sit in between your application and the backend  When your application makes a request  interceptors transform it before sending it to the server  and the interceptors can transform the response on its way back before your application sees it  This is useful for everything from authentication to logging     From the Angular docs   Make sure you use  angular common http throughout your application  That way your requests will be catched by the interceptor   Step 1  create the service   import   as lskeys from       localstorage items   import   Observable   from  rxjs Observable   import   Injectable   from   angular core   import   HttpEvent  HttpInterceptor  HttpHandler  HttpRequest  HttpHeaders   from   angular common http     Injectable   export class HeaderInterceptor implements HttpInterceptor        intercept req  HttpRequest lt any gt   next  HttpHandler   Observable lt HttpEvent lt any gt  gt            if  true       e g  if token exists  otherwise use incomming request              return next handle req clone                   setHeaders                         AuthenticationToken   localStorage getItem  TOKEN                         Tenant   localStorage getItem  TENANT                                                        else               return next handle req                       Step 2  add it to your module   providers                provide  HTTP INTERCEPTORS        useClass  HeaderInterceptor        multi  true    Add this line when using multiple interceptors                            Useful links    Interceptor not working properly  APP INITIALIZER not working in combination with interceptor

[http] How to correctly set Http Request Header in Angular 2

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