How to add and get Header values in WebApi

Question

I need to create a POST method in WebApi so I can send data from application to WebApi method  I m not able to get header value   Here I have added header values in the application    using  var client   new WebClient                             Set the header so it knows we are sending JSON              client Headers HttpRequestHeader ContentType     application json                client Headers Add  Custom    sample                   Make the request             var response   client UploadString url  jsonObj               Following the WebApi post method    public string Postsam  FromBody object jsonData                HttpRequestMessage re   new HttpRequestMessage            var headers   re Headers           if  headers Contains  Custom                          string token   headers GetValues  Custom   First                      What is the correct method for getting header values   Thanks

User · Answer

For WEB API 2 0   I had to use Request Content Headers instead of  Request Headers  and then i declared an extestion as below         lt summary gt          Returns an individual HTTP Header value          lt  summary gt           lt param name  headers  gt  lt  param gt           lt param name  key  gt  lt  param gt           lt returns gt  lt  returns gt      public static string GetHeader this HttpContentHeaders headers  string key  string defaultValue                IEnumerable lt string gt  keys   null          if   headers TryGetValues key  out keys               return defaultValue           return keys First            And then i invoked it by this way     var headerValue   Request Content Headers GetHeader  custom-header-key    default-value      I hope it might be helpful

User · Answer

On the Web API side  simply use Request object instead of creating new HttpRequestMessage       var re   Request      var headers   re Headers       if  headers Contains  Custom                  string token   headers GetValues  Custom   First               return null    Output -

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In case someone is using ASP NET Core for model binding   https   docs microsoft com en-us aspnet core mvc models model-binding  There s is built in support for retrieving values from the header using the  FromHeader  attribute  public string Test  FromHeader string Host   FromHeader string Content-Type          return   Host   Host  Content-Type   Content-Type

User · Answer

Another way using a the TryGetValues method   public string Postsam  FromBody object jsonData        IEnumerable lt string gt  headerValues       if  Request Headers TryGetValues  Custom   out headerValues                 string token   headerValues First

User · Answer

As someone already pointed out how to do this with  Net Core  if your header contains a  -  or some other character  Net disallows  you can do something like   public string Test  FromHeader string host   FromHeader Name    Content-Type    string contentType

User · Answer

For  net Core in GET method  you can do like this    StringValues value1   string DeviceId   string Empty     if  Request Headers TryGetValue  param1   out value1                           DeviceId   value1 FirstOrDefault

User · Answer

try these line of codes working in my case   IEnumerable lt string gt  values   new List lt string gt     this Request Headers TryGetValues  Authorization   out values

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Suppose we have a API Controller  ProductsController   ApiController  There is a Get function which returns some value and expects some input header  for eg  UserName  amp  Password    HttpGet  public IHttpActionResult GetProduct int id        System Net Http Headers HttpRequestHeaders headers   this Request Headers      string token   string Empty      string pwd   string Empty      if  headers Contains  username                  token   headers GetValues  username   First              if  headers Contains  password                  pwd   headers GetValues  password   First                code to authenticate and return some thing     if   Authenticated token  pwd          return Unauthorized        var product   products FirstOrDefault  p    gt  p Id    id       if  product    null                return NotFound              return Ok product       Now we can send the request from page using JQuery     ajax       url   api products 10       type   GET       headers     username    test   password   123         success  function  data            alert data              failure  function  result            alert  Error      result               Hope this helps someone

User · Answer

For  NET Core   string Token   Request Headers  Custom      Or  var re   Request  var headers   re Headers  string token   string Empty  StringValues x   default StringValues   if  headers ContainsKey  Custom         var m   headers TryGetValue  Custom   out x

User · Answer

You need to get the HttpRequestMessage from the current OperationContext  Using OperationContext you can do it like so  OperationContext context   OperationContext Current  MessageProperties messageProperties   context IncomingMessageProperties   HttpRequestMessageProperty requestProperty   messageProperties HttpRequestMessageProperty Name  as HttpRequestMessageProperty   string customHeaderValue   requestProperty Headers  Custom

[c#] How to add and get Header values in WebApi

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