C#•2y ago

❔ So I'm writing an API for a game in C#, and I need the User-Agent to be an empty string.

The dev isn't exactly good at security, and long story short, in order to properly send a request, the User-Agent must be set to an empty string. However, using System.Net.Http, I have been unable to find a way to specifically make it an empty string rather than simply non-existent. To clarify, it must actually exist in the request, but be empty. Is this even possible using System.net.Http?

10 Replies

Angius•2y ago

client.DefaultRequestHeaders.Add("User-Agent", "");

client.DefaultRequestHeaders.Add("User-Agent", "");

doesn't work?

JohnP55OP•2y ago

It doesn't:

Unhandled exception. System.FormatException: The format of value '' is invalid.
   at System.Net.Http.Headers.HttpHeaderParser.ParseValue(String value, Object storeValue, Int32& index)
   at System.Net.Http.Headers.HttpHeaders.ParseAndAddValue(HeaderDescriptor descriptor, HeaderStoreItemInfo info, String value)
   at System.Net.Http.Headers.HttpHeaders.Add(HeaderDescriptor descriptor, String value)
   at System.Net.Http.Headers.HttpHeaders.Add(String name, String value)

Unhandled exception. System.FormatException: The format of value '' is invalid.
   at System.Net.Http.Headers.HttpHeaderParser.ParseValue(String value, Object storeValue, Int32& index)
   at System.Net.Http.Headers.HttpHeaders.ParseAndAddValue(HeaderDescriptor descriptor, HeaderStoreItemInfo info, String value)
   at System.Net.Http.Headers.HttpHeaders.Add(HeaderDescriptor descriptor, String value)
   at System.Net.Http.Headers.HttpHeaders.Add(String name, String value)

it's like it specifically doesn't let you do that

Angius•2y ago

huh

client.DefaultRequestHeaders.Add("User-Agent", null);

client.DefaultRequestHeaders.Add("User-Agent", null);

JohnP55OP•2y ago

getting CS0121 because it's ambiguous between the call with HttpHeaders.Add(string, IEnumerable<string?>) and HttpHeaders.Add(string, string?) and yea if I try anything else then the format of <null> is also invalid

Angius•2y ago

client.DefaultRequestHeaders.Add("User-Agent", (string?)null);

client.DefaultRequestHeaders.Add("User-Agent", (string?)null);

? The docs only say the format exception will be thrown if the name of the header is incorrect Says nothing about the value of it

JohnP55OP•2y ago

yea that's what I did for null

Unhandled exception. System.FormatException: The format of value '<null>' is invalid.
   at System.Net.Http.Headers.HttpHeaderParser.ParseValue(String value, Object storeValue, Int32& index)
   at System.Net.Http.Headers.HttpHeaders.ParseAndAddValue(HeaderDescriptor descriptor, HeaderStoreItemInfo info, String value)
   at System.Net.Http.Headers.HttpHeaders.Add(HeaderDescriptor descriptor, String value)
   at System.Net.Http.Headers.HttpHeaders.Add(String name, String value)

Unhandled exception. System.FormatException: The format of value '<null>' is invalid.
   at System.Net.Http.Headers.HttpHeaderParser.ParseValue(String value, Object storeValue, Int32& index)
   at System.Net.Http.Headers.HttpHeaders.ParseAndAddValue(HeaderDescriptor descriptor, HeaderStoreItemInfo info, String value)
   at System.Net.Http.Headers.HttpHeaders.Add(HeaderDescriptor descriptor, String value)
   at System.Net.Http.Headers.HttpHeaders.Add(String name, String value)

Angius•2y ago

There's .TryAddWithoutValidation() Maybe this one?

JohnP55OP•2y ago

I guess that one worked

JohnP55OP•2y ago

Still getting Cloudflare error code 1020, so there's something left I'll have to look into Yep I got it to work now thank you so much for the help

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ So I'm writing an API for a game in C#, and I need the User-Agent to be an empty string.