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I'm traying to set Etag in response header, but when i check response header in browser i can't see it. By the way this only applies to Etag, i can see another tag and value. By the way i can see it on localhost but when i publish that code to server i cant see.[^]

public static void InsertETag(HttpResponseBase response, Model model)

    var eTagValue = CalculateETag(model);
    if (!string.IsNullOrEmpty(eTagValue))
     var matchETagValue = HttpContext.Current.Request.Headers["If-None-Match"];
     if (matchETagValue != null && matchETagValue == eTagValue)
      response.SuppressContent = true;
      response.StatusCode = 304;
      response.StatusDescription = "Not Modified";
      response.Headers["Content-Length"] = "0";
      response.AppendHeader("ETag", eTagValue);
      response.AppendHeader("ETag", eTagValue);

What I have tried:

Updated 11-Apr-23 5:36am
Dave Kreskowiak 11-Apr-23 10:03am    
DId you set a breakpoint on the inner if statement and make sure the header value we even being set?
Member 14769019 11-Apr-23 10:06am    
Yes, already i tried in local and it worked. I can add any tag and i can see in response header but i can't see only "ETag" tag.

1 solution

You're going to have to get a hold of whoever controls the production server. It may be it is setup to strip or black-list non-standard headers.

Remove Unwanted HTTP Response Headers - Microsoft Community Hub[^]
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