C# .Net6 HTTPClient - Character problems

Question

I'm having a problem with some characters when I use HTTPCLient, where it would have to come
comes \u003cBR\u003e, I would have to solve this I have to use .Replace("\u003c", "<") .Replace("\u003e", ">")?

Am I using the following code?

 using (HttpClient client = new HttpClient())
            {
                client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
                client.DefaultRequestHeaders.Add(header,
                    headerAuthenticationValue);
                
                using (HttpResponseMessage response = await client.GetAsync(url))
                {
                    using (HttpContent content = response.Content)
                    {
                        var tmpStr = await content.ReadAsStringAsync();
                    }
                }
            }

using (HttpClient client = new HttpClient()) <- no! Read the docs "HttpClient is intended to be instantiated once and re-used throughout the life of an application. Instantiating an HttpClient class for every request will exhaust the number of sockets available under heavy loads. This will result in SocketException errors." — JHBonarius
– JHBonarius, Commented Jan 4, 2022 at 11:31
Anyhow. What is your actual problem? That the data you are receiving is not in the format you want is to be? I don't think it's an issue with HttpClient, but with the data source. It seems to be unicode , maybe you're missing some json serializer? Or some other decoder? What's the source? — JHBonarius
– JHBonarius, Commented Jan 4, 2022 at 11:34
Thanks for the using tip (HttpClient client = new HttpClient()). I'm updating my code .Net Frameworks 4.7.2 to .Net 6 and before the information came correctly. The text is: Peças e Acessórios Originais ARNO<BR>Redutor Completo And it's coming: Peças e Acessórios Originais ARNO\\u003cBR\\u003eRedutor Completo Another thing that has changed is that before I was on Visual Studio 2019 and Windows10 and now I'm on Ubuntu with VSCode, I started the migration on Ubuntu, but I don't think that's the problem. — Maykon Luiz Matos Araujo
– Maykon Luiz Matos Araujo, Commented Jan 4, 2022 at 12:00
How do you get the source? this looks like double encoding. Normally \u003c would resolve to a unicode character, but since the \ is escaped by an extra \, thus is not parsed correctly. — JHBonarius
– JHBonarius, Commented Jan 4, 2022 at 12:55
Does this answer your question? Getting an UTF-8 response with httpclient in Windows Store apps — JHBonarius
– JHBonarius, Commented Jan 4, 2022 at 12:57

Métoule · Accepted Answer · 2022-01-04 13:02:51Z

1

You're receiving a string that contains escaped Unicode characters representing HTML characters. You can use WebUtility.HtmlDecode:

var str = WebUtility.HtmlDecode("\u003cBR\u003e"); // returns <BR>

or in your case:

var tmpStr = WebUtility.HtmlDecode(await content.ReadAsStringAsync());

edited Jan 4, 2022 at 13:02

answered Jan 4, 2022 at 12:52

Métoule

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4 Comments

JHBonarius Over a year ago

\u003c is not a HTML character, but unicode. Furthermore, he is actually receiving \\u003c

Métoule Over a year ago

It's the escaped unicode representation of the HTML character <, and using WebUtility.HtmlDecode correctly replaces it :) It's unclear if they receive \u003c (as stated in the question) or \\u003c (as stated in their comment).

JHBonarius Over a year ago

IMHO it's like using the back-end of a screwdriver to drive in a nail... HtmlDecode is to decode a string that has been html-encoded, not to fix other issues that can be solved a better way.

Maykon Luiz Matos Araujo Over a year ago

I received \\u003c, the strange thing that when I use the code: var request = HttpWebRequest.Create(url); request.ContentType = "application/json"; request.Method = "GET"; request.Headers.Add(header, headerAuthenticationValue); using (HttpWebResponse response = request.GetResponse() as HttpWebResponse) { using (StreamReader reader = new StreamReader(response.GetResponseStream())) { var tmpStr = eader.ReadToEnd(); } } In .Net Frameworks 4.7.2 it works.

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