有没有一种更优雅/更干净的方式来使用TryAddWithoutValidation方法来设置HttpRequestMessage头？
有没有一种更优雅/更干净的方式来使用TryAddWithoutValidation方法来设置HttpRequestMessage头？
提问于 2020-07-22 09:21:02
我在几个方法中使用了HttpClient中的HttpRequestMessage，目前，我在我的代码中重复了以下代码：
这段代码是由https://curl.olsh.me/转换的，所以我不确定这里是否使用了最佳实践。
// using System.Net.Http;
using (var httpClient = new HttpClient(handler))
{
using (var request = new HttpRequestMessage(new HttpMethod("POST"), "https://www.url.com/"))
{
request.Headers.TryAddWithoutValidation("authority", "www.url.com");
request.Headers.TryAddWithoutValidation("pragma", "no-cache");
request.Headers.TryAddWithoutValidation("cache-control", "no-cache");
request.Headers.TryAddWithoutValidation("dnt", "1");
request.Headers.TryAddWithoutValidation("x-requested-with", "XMLHttpRequest");
request.Headers.TryAddWithoutValidation("x-odesk-csrf-token", "19b91748869456a4ae700ffb69077745");
request.Headers.TryAddWithoutValidation("user-agent", "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.97 Safari/537.36");
request.Headers.TryAddWithoutValidation("accept", "*/*");
request.Headers.TryAddWithoutValidation("origin", "https://www.url.com");
request.Headers.TryAddWithoutValidation("sec-fetch-site", "same-origin");
request.Headers.TryAddWithoutValidation("sec-fetch-mode", "cors");
request.Headers.TryAddWithoutValidation("sec-fetch-dest", "empty");
request.Headers.TryAddWithoutValidation("referer", "https://www.url.com/");
request.Headers.TryAddWithoutValidation("accept-language", "pt-BR,pt;q=0.9,en-US;q=0.8,en;q=0.7,fr-FR;q=0.6,fr;q=0.5");
request.Headers.TryAddWithoutValidation("cookie", "G_AUTHUSER_H=1; AccountSecurity_cat=fc4d14f1.oauth2v2_812293");
request.Content.Headers.ContentType = MediaTypeHeaderValue.Parse("application/json");
var response = await httpClient.SendAsync(request);
IEnumerable<string> cookies = new List<string>();
response.Headers.TryGetValues("Set-Cookie", out cookies);回答 3
Stack Overflow用户
回答已采纳
发布于 2020-08-12 04:46:35
非常感谢@Jaquez和@Kuroiyatsu的回答，我得到了以下两个答案
public async Task<string> postAsync(param1, param2)
{
using (var httpClient = new HttpClient(handler))
{
using (var request = new HttpRequestMessage(new HttpMethod("POST"), "https://www.url.com/"))
{
....
var response = await PostAsync(param1, param2);
var variable = JsonSerializer.Deserialize<Obj>(response);
WebScrapFunc(response);
...虽然从PostAsync返回一个Task<string>看起来很奇怪，但它很符合我的意图。
Stack Overflow用户
发布于 2020-07-22 10:07:13
我假设您正在尝试理解如何将有问题的代码提取到帮助器方法中，因为它使用了块。如果没有，请澄清，我会调整我的答案。在这种情况下，我会这样做：
Task<HttpResponseMessage> PostAsyncWithHeaders(Uri uri)
{
var response = new Task<HttpResponseMessage>();
using (var httpClient = new HttpClient(handler))
using (var request = new HttpRequestMessage(HttpMethod.Post, uri))
{
//Add your headers as before
response = await httpClient.SendAsync(request);
}
return response;
}然后，您可以从任何可以访问的地方调用该方法，如下所示：
response = await PostAsyncWithHeaders(new Uri("https://www.url.com/"));
IEnumerable<string> cookies = new List<string>();
response.Headers.TryGetValues("Set-Cookie", out cookies);
//Presumably consume cookies (yum!)Stack Overflow用户
发布于 2020-07-22 10:17:55
我在.NET Core3中做了这个测试，以供参考。
如果你想在整个代码库中重用你的方法，你可以尝试下面这样的方法：
static async Task Main(string[] args)
{
var client = new HttpClient();
// .NET core setting the content type.
client.DefaultRequestHeaders.TryAddWithoutValidation("Content-Type", "application/json; charset=utf-8");
// this is wrapped in the using statement.
using var requestMessage = GetRequestMessage("https://www.url.com/", HttpMethod.Post);
await client.SendAsync(requestMessage);
}
// Get the request message for reuse. You can then reuse this for maybe different end-points and method types.
// the "referer" or "origin" values can be passed in as parameters too.
static HttpRequestMessage GetRequestMessage(string url, HttpMethod method)
{
var request = new HttpRequestMessage(method, url);
request.Headers.TryAddWithoutValidation("authority", "www.url.com");
request.Headers.TryAddWithoutValidation("pragma", "no-cache");
request.Headers.TryAddWithoutValidation("cache-control", "no-cache");
request.Headers.TryAddWithoutValidation("dnt", "1");
request.Headers.TryAddWithoutValidation("x-requested-with", "XMLHttpRequest");
request.Headers.TryAddWithoutValidation("x-odesk-csrf-token", "19b91748869456a4ae700ffb69077745");
request.Headers.TryAddWithoutValidation("user-agent", "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.97 Safari/537.36");
request.Headers.TryAddWithoutValidation("accept", "*/*");
request.Headers.TryAddWithoutValidation("origin", "https://www.url.com");
request.Headers.TryAddWithoutValidation("sec-fetch-site", "same-origin");
request.Headers.TryAddWithoutValidation("sec-fetch-mode", "cors");
request.Headers.TryAddWithoutValidation("sec-fetch-dest", "empty");
request.Headers.TryAddWithoutValidation("referer", "https://www.url.com/");
request.Headers.TryAddWithoutValidation("accept-language", "pt-BR,pt;q=0.9,en-US;q=0.8,en;q=0.7,fr-FR;q=0.6,fr;q=0.5");
request.Headers.TryAddWithoutValidation("cookie", "G_AUTHUSER_H=1; AccountSecurity_cat=fc4d14f1.oauth2v2_812293");
return request;
}如果您在控制台程序中使用它，则可以在using语句中创建HttpClient。但是，如果您打算在.net核心中的web应用程序中使用客户端，则需要使用services.AddHttpClient方法和依赖项注入。这是因为HttpClient并不打算在每次使用之后都处理掉，特别是如果您在给定的调用中多次使用它的话。
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原文链接：
https://stackoverflow.com/questions/63025360
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