How can we add Header Parameters to HTTPCLIENT object

Question

C# How can we add Header Parameters to HTTPCLIENT object Post-Man Screen-Shot:

A screen shot of POST-MAN which I'm capable of doing there

I have tried the following code snippet as well but, no use.

HttpClient _client = new HttpClient { BaseAddress = new Uri(ServiceBaseURL) };
_client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
_client.DefaultRequestHeaders.TryAddWithoutValidation("Param1", "Value1");
_client.DefaultRequestHeaders.TryAddWithoutValidation("Param2", "Value2");
_client.DefaultRequestHeaders.TryAddWithoutValidation("Param3", "Value3");

Looking forward for help. I really appreciate your help.

Hi Naresh can you please post full code snippet after the solution. I am having same requirement. — Mehul
– Mehul, Commented Apr 23, 2020 at 15:45

maccettura · Accepted Answer · 2017-04-06 15:14:44Z

12

I think you want the regular DefaultRequestHeaders property and not the Accept property:

_client.DefaultRequestHeaders.Add("Param1", "Value1");

You can also add the headers as part of the message (if these parameters change per request use this way instead):

using (var message = new HttpRequestMessage(HttpMethod.Post, "/someendpoint"))
{
    message.Headers.Add("Param1", "Value1");
}

answered Apr 6, 2017 at 15:14

maccettura

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2 Comments

Naresh Over a year ago

Thanks a mill for your response @maccettura

maccettura Over a year ago

@nareshmekala if my answer worked for you please mark it as the right answer so other users know what worked.

hkutluay · Accepted Answer · 2021-07-14 11:20:31Z

1

I thought header parameters are the root cause for an issue with my code which is not. Either the ways worked for me

 _client.DefaultRequestHeaders.TryAddWithoutValidation("Param1", "Value1"); 
 _client.DefaultRequestHeaders.Add("Param1", "Value1");

Thanks Again @maccettura

edited Jul 14, 2021 at 11:20

hkutluay

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answered Apr 12, 2017 at 9:55

Naresh

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