c# httpcontent - add Header If-Match errors

Question

adding new header "If-Match"

 using (HttpContent content = new StringContent(serializedObject))
        {
            content.Headers.Remove("Content-Type");
            content.Headers.Add("Content-Type", "application/json");
            content.Headers.Remove("If-Match");
            content.Headers.Add("If-Match", "XXXXXXXXXX");
        }

throws :

Misused header name. Make sure request headers are used with HttpRequestMessage, response headers with HttpResponseMessage, and content headers with HttpContent objects.

i can add any other headers fine

you're setting a response header, but using a request header reserved word? — user326608
– user326608, Commented Jun 5, 2019 at 15:27
the api im working with requires the If-Match to be put in the header for the PUT — Samw
– Samw, Commented Jun 5, 2019 at 15:31

user326608 · Accepted Answer · 2019-06-05 15:41:53Z

1

edited:

using(var request = new HttpRequestMessage(HttpMethod.Put, new Uri(url))) {
    request.Headers.Remove("If-Match");
    request.Headers.TryAddWithoutValidation("If-Match", "XXXXXXXXXX");
    using (HttpContent content = new StringContent(serializedObject))
    {
        content.Headers.Remove("Content-Type");
        content.Headers.Add("Content-Type", "application/json");
    }
    // ...
}

edited Jun 5, 2019 at 15:41

answered Jun 5, 2019 at 15:30

user326608

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