Custom header to HttpClient request

Question

How do I add a custom header to a HttpClient request  I am using PostAsJsonAsync method to post the JSON  The custom header that I would  need to be added is    X-Version  1    This is what I have done so far   using  var client   new HttpClient          client BaseAddress   new Uri  https   api clickatell com         client DefaultRequestHeaders Accept Clear        client DefaultRequestHeaders Authorization   new AuthenticationHeaderValue  Bearer    xxxxxxxxxxxxxxxxxxxx        client DefaultRequestHeaders Accept Add new MediaTypeWithQualityHeaderValue  application json         var response   client PostAsJsonAsync  rest message   svm  Result

User · Answer

I have found the answer to my question   client DefaultRequestHeaders Add  X-Version   1      That should add a custom header to your request

User · Answer

Here is an answer based on that by Anubis  which is a better approach as it doesn t modify the headers for every request  but which is more equivalent to the code in the original question  using Newtonsoft Json       var client   new HttpClient    var httpRequestMessage   new HttpRequestMessage               Method   HttpMethod Post          RequestUri   new Uri  quot https   api clickatell com rest message quot            Headers                    HttpRequestHeader Authorization ToString     quot Bearer xxxxxxxxxxxxxxxxxxx quot                   HttpRequestHeader Accept ToString     quot application json quot                    quot X-Version quot    quot 1 quot                       Content   new StringContent JsonConvert SerializeObject svm           var response   client SendAsync httpRequestMessage  Result

User · Answer

There is a Headers property in the HttpRequestMessage class  You can add custom headers there  which will be sent with each HTTP request  The DefaultRequestHeaders in the HttpClient class  on the other hand  sets headers to be sent with each request sent using that client object  hence the name Default Request Headers    Hope this makes things more clear  at least for someone seeing this answer in future

User · Answer

var request   new HttpRequestMessage       RequestUri   new Uri   your request url string         Method   HttpMethod Post      Headers                X-Version    1       HERE IS HOW TO ADD HEADERS            HttpRequestHeader Authorization ToString      your authorization token                HttpRequestHeader ContentType ToString     multipart mixed      use this content type if you want to send more than one content type            Content   new MultipartContent      Just example of request sending multipart request         new ObjectContent lt  YOUR JSON OBJECT TYPE  gt               new  YOUR JSON OBJECT TYPE INSTANCE                          new JsonMediaTypeFormatter                  application json       this will add  Content-Type  header for the first part of request         new ByteArrayContent  BINARY DATA                 Headers        this will add headers for the second part of request                    Content-Type    application Executable                        Content-Disposition    form-data  filename   test pdf

[c#] Custom header to HttpClient request

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