Adding header to all request with Retrofit 2

Question

Retrofit 2 s documentation says      Headers that need to be added to every request can be specified using an OkHttp interceptor    It can be done easily using the previous version  here s the related QA   But using retrofit 2  I couldn t find something like setRequestInterceptor or setInterceptor method that can be applied to Retrofit Builder object   Also it seems that there s no RequestInterceptor in OkHttp anymore  Retrofit s doc refers us to Interceptor that I didn t quite understand how to use it for this purpose   How can I do this

User · Answer

In my case addInterceptor  didn t work to add HTTP headers to my request  I had to use addNetworkInterceptor    Code is as follows   OkHttpClient Builder httpClient   new OkHttpClient Builder    httpClient addNetworkInterceptor new AddHeaderInterceptor       And the interceptor code   public class AddHeaderInterceptor implements Interceptor        Override     public Response intercept Chain chain  throws IOException            Request Builder builder   chain request   newBuilder            builder addHeader  Authorization    MyauthHeaderContent             return chain proceed builder build               This and more examples on this gist

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For Logging your request and response you need an interceptor and also for setting the header you need an interceptor  Here s the solution for adding both the interceptor at once using retrofit 2 1   public OkHttpClient getHeader final String authorizationValue             HttpLoggingInterceptor interceptor   new HttpLoggingInterceptor            interceptor setLevel HttpLoggingInterceptor Level BODY           OkHttpClient okClient   new OkHttpClient Builder                    addInterceptor interceptor                   addNetworkInterceptor                          new Interceptor                                  Override                             public Response intercept Interceptor Chain chain  throws IOException                                   Request request   null                                  if  authorizationValue    null                                        Log d  --Authorization--    authorizationValue                                        Request original   chain request                                           Request customization  add request headers                                     Request Builder requestBuilder   original newBuilder                                                addHeader  Authorization   authorizationValue                                        request   requestBuilder build                                                                      return chain proceed request                                                                             build            return okClient           Now in your retrofit object add this header in the client  Retrofit retrofit   new Retrofit Builder                    baseUrl url                   client getHeader authorizationValue                    addConverterFactory GsonConverterFactory create                     build

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OkHttpClient Builder httpClient   new OkHttpClient Builder     httpClient addInterceptor new Interceptor          Override     public Response intercept Chain chain  throws IOException           Request request   chain request   newBuilder   addHeader  parameter    value   build            return chain proceed request             Retrofit retrofit   new Retrofit Builder   addConverterFactory GsonConverterFactory create    baseUrl url  client httpClient build    build

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Use this Retrofit Client   class RetrofitClient2 context  Context    OkHttpClient          private var mContext Context   context     private var retrofit  Retrofit    null      val client  Retrofit          get                 val logging   HttpLoggingInterceptor   setLevel HttpLoggingInterceptor Level BODY               val client   OkHttpClient Builder                        connectTimeout Constants TIME OUT  TimeUnit SECONDS                       readTimeout Constants TIME OUT  TimeUnit SECONDS                       writeTimeout Constants TIME OUT  TimeUnit SECONDS              client addInterceptor logging              client interceptors   add AddCookiesInterceptor mContext                val gson   GsonBuilder   setDateFormat  yyyy-MM-dd T HH mm ssZ   create               if  retrofit    null                     retrofit   Retrofit Builder                            baseUrl Constants URL                           addConverterFactory GsonConverterFactory create gson                            client client build                             build                             return retrofit                 I m passing the JWT along with every request  Please don t mind the variable names  it s a bit confusing    class AddCookiesInterceptor context  Context    Interceptor       val mContext  Context   context      Throws IOException  class      override fun intercept chain  Interceptor Chain   Response           val builder   chain request   newBuilder           val preferences   CookieStore   getCookies mContext          if  preferences    null                for  cookie in preferences                      builder addHeader  Authorization   cookie                                  return chain proceed builder build

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RetrofitHelper library written in kotlin  will let you make API calls  using a few lines of code     Add headers in your application class like this     class Application   Application          override fun onCreate         super onCreate            retrofitClient   RetrofitClient instance                       api url                  setBaseUrl  https   reqres in                          you can set multiple urls                            setUrl  example   http   ngrok io api                          set timeouts                  setConnectionTimeout 4                   setReadingTimeout 15                        enable cache                  enableCaching this                        add Headers                  addHeader  Content-Type    application json                    addHeader  client    android                    addHeader  language   Locale getDefault   language                   addHeader  os   android os Build VERSION RELEASE                         companion object           lateinit var retrofitClient  RetrofitClient                      And then make your call     retrofitClient Get lt GetResponseModel gt                  set path              setPath  api users 2                 set url params Key-Value or HashMap              setUrlParams  KEY   Value                  you can add header here              addHeaders  key   value                setResponseHandler GetResponseModel  class java                  object   ResponseHandler lt GetResponseModel gt                          override fun onSuccess response  Response lt GetResponseModel gt                             super onSuccess response                            handle response                                          run this    For more information see the documentation

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If you use addInterceptor method for add HttpLoggingInterceptor  it won t be logging the things that added by other interceptors applied later than HttpLoggingInterceptor   For example  If you have two interceptors  HttpLoggingInterceptor  and  AuthInterceptor   and HttpLoggingInterceptor applied first  then you  can t view the http-params or headers which set by AuthInterceptor   OkHttpClient Builder builder   new OkHttpClient Builder    addNetworkInterceptor logging   addInterceptor new AuthInterceptor       I solved it  via using addNetworkInterceptor method

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In kotlin adding interceptor looks that way    addInterceptor  it proceed it request   newBuilder   addHeader  Cache-Control    no-store   build

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Kotlin version would be   fun getHeaderInterceptor   Interceptor      return object   Interceptor            Throws IOException  class          override fun intercept chain  Interceptor Chain   Response               val request               chain request   newBuilder                        header Headers KEY AUTHORIZATION   Bearer                             build               return chain proceed request                      private fun createOkHttpClient    OkHttpClient       return OkHttpClient Builder                apply                   if BuildConfig DEBUG                       this addInterceptor HttpLoggingInterceptor   setLevel HttpLoggingInterceptor Level BASIC                                                addInterceptor getHeaderInterceptor                 build

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The Latest Retrofit Version HERE -  2 1 0   lambda version     builder addInterceptor chain - gt        Request request   chain request   newBuilder   addHeader  key    value   build        return chain proceed request           ugly long version     builder addInterceptor new Interceptor          Override public Response intercept Chain chain  throws IOException         Request request   chain request   newBuilder   addHeader  key    value   build          return chain proceed request                 full version   class Factory    public static APIService create Context context       OkHttpClient Builder builder   new OkHttpClient   newBuilder      builder readTimeout 10  TimeUnit SECONDS     builder connectTimeout 5  TimeUnit SECONDS      if  BuildConfig DEBUG        HttpLoggingInterceptor interceptor   new HttpLoggingInterceptor        interceptor setLevel HttpLoggingInterceptor Level BASIC       builder addInterceptor interceptor          builder addInterceptor chain - gt        Request request   chain request   newBuilder   addHeader  key    value   build        return chain proceed request            builder addInterceptor new UnauthorisedInterceptor context      OkHttpClient client   builder build       Retrofit retrofit         new Retrofit Builder   baseUrl APIService ENDPOINT  client client  addConverterFactory GsonConverterFactory create    addCallAdapterFactory RxJavaCallAdapterFactory create    build       return retrofit create APIService class           gradle file  you need to add the logging interceptor if you plan to use it        ----- Retrofit   compile  com squareup retrofit2 retrofit 2 1 0    compile  com squareup retrofit2 converter-gson 2 1 0    compile  com squareup retrofit2 adapter-rxjava 2 1 0    compile  com squareup okhttp3 logging-interceptor 3 4 0

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Try this type header for Retrofit 1 9 and 2 0  For Json Content Type    Headers   Accept  application json     POST  user classes   Call lt playlist gt  addToPlaylist  Body PlaylistParm parm     You can add many more headers i e   Headers            Accept  application json            User-Agent  Your-App-Name            Cache-Control  max-age 640000           Dynamically Add to headers    POST  user classes   Call lt ResponseModel gt  addToPlaylist  Header  Content-Type   String content type   Body RequestModel req     Call you method i e  mAPI addToPlayList  application json   playListParam     Or  Want to pass everytime then Create HttpClient object with http Interceptor   OkHttpClient httpClient   new OkHttpClient            httpClient networkInterceptors   add new Interceptor                  Override             public com squareup okhttp Response intercept Chain chain  throws IOException                   Request Builder requestBuilder   chain request   newBuilder                    requestBuilder header  Content-Type    application json                    return chain proceed requestBuilder build                                 Then add to retrofit object  Retrofit retrofit   new Retrofit Builder   baseUrl BASE URL  client httpClient  build      UPDATE if you are using Kotlin remove the      else it will not work

[java] Adding header to all request with Retrofit 2

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