C# – Adding HttpClient headers generates a FormatException with some values

cdotnet-httpclientgoogle-cloud-messaging

This occurred within the context of coding against Google Cloud Messaging, but applies elsewhere.

Consider the following:

var http = new HttpClient();
http.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("key=XXX");

and

var http = new HttpClient();
http.DefaultRequestHeaders.Add("Authorization", "key=XXX");

both of which generate a FormatException:

System.FormatException : The format of value key=XXX' is invalid.

The solution is to remove the equals sign.

Digging into reflector shows there is oodles of validation and parsing code that runs when adding a a new header value. Why is all this necessary? Shouldn't this client just be getting out of our way?
How do you escape the equals sign so that adding this value succeeds?

Best Answer

Not sure if still relevant, but I recently ran into this same issue and was able to solve it by calling a different method to add the header information:

var http = new HttpClient();
http.DefaultRequestHeaders.TryAddWithoutValidation("Authorization", "key=XXX");

Related Solutions

C# – Adding values to a C# array

You can do this way -

int[] terms = new int[400];
for (int runs = 0; runs < 400; runs++)
{
    terms[runs] = value;
}

Alternatively, you can use Lists - the advantage with lists being, you don't need to know the array size when instantiating the list.

List<int> termsList = new List<int>();
for (int runs = 0; runs < 400; runs++)
{
    termsList.Add(value);
}

// You can convert it back to an array if you would like to
int[] terms = termsList.ToArray();

Edit: a) for loops on List<T> are a bit more than 2 times cheaper than foreach loops on List<T>, b) Looping on array is around 2 times cheaper than looping on List<T>, c) looping on array using for is 5 times cheaper than looping on List<T> using foreach (which most of us do).

C# – POSTing JsonObject With HttpClient From Web API

With the new version of HttpClient and without the WebApi package it would be:

var content = new StringContent(jsonObject.ToString(), Encoding.UTF8, "application/json");
var result = client.PostAsync(url, content).Result;

Or if you want it async:

var result = await client.PostAsync(url, content);

Best Answer

Related Solutions

C# – Adding values to a C# array

C# – POSTing JsonObject With HttpClient From Web API

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