Adding a HTTP header to the Angular HttpClient doesn t send the header why

Question

Here is my code    import   HttpClient  HttpErrorResponse  HttpHeaders   from   angular common http       logIn username  string  password  string        const url    http   server com index php       const body   JSON stringify  username  username                                   password  password        const headers   new HttpHeaders        headers set  Content-Type    application json  charset utf-8        this http post url  body   headers  headers   subscribe           data    gt                console log data                       err  HttpErrorResponse    gt                if  err error instanceof Error                    console log  Client-side error occured                   else                   console log  Server-side error occured                                        and here the network debug   Request Method POST Status Code 200 OK Accept application json  text plain      Accept-Encoding gzip  deflate Accept-Language en-US en q 0 8 Cache-Control no-cache Connection keep-alive Content-Length 46 Content-Type text plain   and Data are stored in  Request Payload  but in my server doesn t received the POST values   print r   POST   Array       I believe the error comes from the header not set during the POST  what did I do wrong

User · Answer

In the manual  https   angular io guide http  I read  The HttpHeaders class is immutable  so every set   returns a new instance and applies the changes   The following code works for me with angular-4     return this http get url   headers  new HttpHeaders   set  UserEmail   email

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In my legacy app Array from of prototype js was conflicting with angular s Array from that was causing this problem  I resolved it by saving angular s Array from version and reassigning it after prototype load

User · Answer

I was struggling with this as well  I used an interceptor  it captures the response headers  then clone the headers since headers are immutable objects  and then sends the modified headers  https   angular io guide http intercepting-requests-and-responses

User · Answer

The instances of the new HttpHeader class are immutable objects  Invoking class methods will return a new instance as result  So basically  you need to do the following   let headers   new HttpHeaders    headers   headers set  Content-Type    application json  charset utf-8      or  const headers   new HttpHeaders   Content-Type   application json  charset utf-8       Update  adding multiple headers  let headers   new HttpHeaders    headers   headers set  h1    v1   set  h2   v2      or  const headers   new HttpHeaders   h1   v1   h2   v2       Update  accept object map for HttpClient headers  amp  params  Since 5 0 0-beta 6 is now possible to skip the creation of a HttpHeaders object an directly pass an object map as argument  So now its possible to do the following   http get  someurl       headers    header1   value1   header2   value2

User · Answer

I was with Angular 8 and the only thing which worked for me was this     getCustomHeaders    HttpHeaders       const headers   new HttpHeaders          set  Content-Type    application json          set  Api-Key    xxx        return headers

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Angular 8 HttpClient Service example with Error Handling and Custom Header      import   Injectable   from   angular core       import   HttpClient  HttpHeaders  HttpErrorResponse   from   angular common http       import   Student   from     model student       import   Observable  throwError   from  rxjs       import   retry  catchError   from  rxjs operators         Injectable         providedIn   root             export class ApiService             API path       base path    http   localhost 3000 students          constructor private http  HttpClient                Http Options       httpOptions             headers  new HttpHeaders              Content-Type    application json                               Handle API errors       handleError error  HttpErrorResponse            if  error error instanceof ErrorEvent                 A client-side or network error occurred  Handle it accordingly            console error  An error occurred    error error message             else                The backend returned an unsuccessful response code               The response body may contain clues as to what went wrong            console error               Backend returned code   error status                    body was    error error                          return an observable with a user-facing error message         return throwError             Something bad happened  please try again later                         Create a new item       createItem item   Observable lt Student gt            return this http            post lt Student gt  this base path  JSON stringify item   this httpOptions             pipe              retry 2               catchError this handleError                                                 Check complete example tutorial here

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I struggled with this for a long time  I am using Angular 6 and I found that  let headers   new HttpHeaders    headers   headers append  key    value      did not work  But what did work was  let headers   new HttpHeaders   append  key    value      did  which makes sense when you realize they are immutable  So having created a header you can t add to it  I haven t tried it  but I suspect  let headers   new HttpHeaders    let headers1   headers append  key    value      would work too

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set http headers like below in your http request  return this http get url    headers  new HttpHeaders   Authorization    Bearer     token

User · Answer

To add multiples params or headers you can do the following   constructor private  http  HttpClient              const url      environment APP API  api request    let headers   new HttpHeaders   set  header1   hvalue1      create header object headers   headers append  header2   hvalue2      add a new header  creating a new object headers   headers append  header3   hvalue3      add another header  let params   new HttpParams   set  param1   value1      create params object params   params append  param2   value2      add a new param  creating a new object params   params append  param3   value3      add another param   return this  http get lt any   gt  url    headers  headers  params  params

User · Answer

First  you need to add HttpHeaders with HttpClient import   HttpClient HttpHeaders    from   angular common http    your constructor should be like this  constructor private http  HttpClient       then you can use like this    let header   new HttpHeaders    quot Authorization quot    quot Bearer  quot  token        const requestOptions      headers  header                                                                                                                                                                                    return this http get lt any gt  url  requestOptions           toPromise            then data  gt                                  return data

[angular] Adding a HTTP header to the Angular HttpClient doesn't send the header, why?

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