CODEWITHSUNDEEP
.nethttp-headershttpwebrequest
watkipet
watkipet

Reputation: 1069

Using .NET HttpWebRequest, how do I add a Range header with a single number?

I'm trying to interface with a REST interface where there's a named Range header that takes a single value, not a from and to value. I.e., it takes: Range: dli-depth=1 not Range: dli-depth=0-1

I can use HttpWebRequest.AddRange() to add the Range header to my HttpWebRequest, but no matter which variant I pick, I always end up with a dash in the value to the right of the equals sign. The device in question won't accept a Range header with a dash in the value. If I attempt to add Range as a custom header:

myRequest.Headers.Add("Range", $"dli-depth={depth}");

...I get this exception:

System.ArgumentException: 'The 'Range' header must be modified using the appropriate property or method.

How do I add this (perhaps non-standard) Range HTTP header in .NET?

Upvotes: 0

Views: 498

Answers (1)

Access Denied
Access Denied

Reputation: 9501

Since you have non-standard header, .net won't allow you to add this header. You can use the following hack:

MethodInfo method = typeof(WebHeaderCollection).GetMethod
                        ("AddWithoutValidate", BindingFlags.Instance | BindingFlags.NonPublic);
HttpWebRequest request = (HttpWebRequest) WebRequest.Create(<your url>);
string key = "Range";
string val = $"dli-depth={depth}";
method.Invoke (request.Headers, new object[] { key, val });

Upvotes: 2

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