HttpResponse does not contain a definition for AddHeader for Dot Net Core

Question

When moving a project into .Net Core, AddHeader throws an error:

Error CS1061 'HttpResponse' does not contain a definition for 'AddHeader' and no extension method 'AddHeader' accepting a first argument of type 'HttpResponse' could be found (are you missing a using directive or an assembly reference?) .NETCoreApp,Version=v1.0

goamn · Answer 1 · 2017-04-04T05:44:23.543

8

The answer is to instead do the following (without using AddHeader) :

Response.Headers["key-goes-here"] = "value-goes-here";

edited Apr 04 '17 at 05:44

answered Apr 03 '17 at 06:48

goamn

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thanks - "`IHeaderDictionary has a different indexer contract than IDictionary, where it will return StringValues.Empty for missing entries.`" – user326608 Nov 25 '17 at 16:42

McKabue · Accepted Answer · 2017-04-04T05:09:43.590

3

Checkout

Examples:

string combineValue = httpContext.Request.Headers["header1];
if (string.IsNullOrEmpty(combineValue)) // ...
var values = httpContext.Request.Headers["header1"];
if (StringValues.IsNullOrEmpty(values)) // ...
httpContext.Response.Headers["CustomHeader1"] = "singleValue";
httpContext.Response.Headers["CustomHeader2"] =  new[] { "firstValue", "secondValue" };

edited Apr 04 '17 at 05:09

answered Apr 03 '17 at 11:20

McKabue

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Your link is dead. check to make sure you entered it correctly. – Nkosi Apr 03 '17 at 18:39
Ah I see, good point, I am doing the combined values wrong, made it into single value only. – goamn Apr 04 '17 at 05:43

score 1 · Answer 3 · answered Feb 15 '21 at 12:00

1

Or you can just say:

Response.Headers.Add("key", "value");

answered Feb 15 '21 at 12:00

Juvinal Alvarado

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HttpResponse does not contain a definition for AddHeader for Dot Net Core

3 Answers3

Linked