Restore 2-param AddCookie(name, value) overload

PR #1966 replaced the simple AddCookie(name, value) with a 4-param
overload requiring domain upfront, breaking the public API. This
restores the 2-param form by deferring domain resolution to execution
time using CookieContainer.Add(Uri, Cookie).

- Add _cookies pending list and PendingCookies accessor to RestRequest
- Add AddCookie(name, value) extension that stores cookies for deferred
  resolution alongside the existing 4-param AddCookie overload
- Resolve pending cookies at execution time in RestClient.Async.cs
  using the request URL to infer domain
- Update cookie documentation across all doc versions to show both forms
- Fix Cookes typo in docs

Closes #2284

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: alexeyzimarev

docs/docs/usage/request.md

@@ -227,11 +227,17 @@ You can add cookies to a request using the `AddCookie` method:
 request.AddCookie("foo", "bar");
 ```
 
+The simple two-parameter form defers domain resolution until execution time — the cookie domain is inferred from the request URL. If you need to specify the path and domain explicitly, use the four-parameter overload:
+
+```csharp
+request.AddCookie("foo", "bar", "/path", "example.com");
+```
+
 RestSharp will add cookies from the request as cookie headers and then extract the matching cookies from the response. You can observe and extract response cookies using the `RestResponse.Cookies` properties, which has the `CookieCollection` type.
 
-However, the usage of a default URL segment parameter is questionable as you can just include the parameter value to the base URL of the client. There is, however, a `CookieContainer` instance on the request level. You can either assign the pre-populated container to `request.CookieContainer`, or let the container be created by the request when you call `AddCookie`. Still, the container is only used to extract all the cookies from it and create cookie headers for the request instead of using the container directly. It's because the cookie container is normally configured on the `HttpClientHandler` level and cookies are shared between requests made by the same client. In most of the cases this behaviour can be harmful.
+There is a `CookieContainer` instance on the request level. You can either assign the pre-populated container to `request.CookieContainer`, or let the container be created by the request when you call `AddCookie`. The container is used to extract all the cookies from it and create cookie headers for the request instead of using the container directly. It's because the cookie container is normally configured on the `HttpClientHandler` level and cookies are shared between requests made by the same client. In most of the cases this behaviour can be harmful.
 
-If your use case requires sharing cookies between requests made by the client instance, you can use the client-level `CookieContainer`, which you must provide as the options' property. You can add cookies to the container using the container API. No response cookies, however, would be auto-added to the container, but you can do it in code by getting cookies from the `Cookes` property of the response and adding them to the client-level container available via `IRestClient.Options.CookieContainer` property.
+If your use case requires sharing cookies between requests made by the client instance, you can use the client-level `CookieContainer`, which you must provide as the options' property. You can add cookies to the container using the container API. No response cookies, however, would be auto-added to the container, but you can do it in code by getting cookies from the `Cookies` property of the response and adding them to the client-level container available via `IRestClient.Options.CookieContainer` property.
 
 ## Request Body
 

docs/versioned_docs/version-v110/usage/usage.md

@@ -230,11 +230,17 @@ You can add cookies to a request using the `AddCookie` method:
 request.AddCookie("foo", "bar");
 ```
 
+The simple two-parameter form defers domain resolution until execution time — the cookie domain is inferred from the request URL. If you need to specify the path and domain explicitly, use the four-parameter overload:
+
+```csharp
+request.AddCookie("foo", "bar", "/path", "example.com");
+```
+
 RestSharp will add cookies from the request as cookie headers and then extract the matching cookies from the response. You can observe and extract response cookies using the `RestResponse.Cookies` properties, which has the `CookieCollection` type.
 
-However, the usage of a default URL segment parameter is questionable as you can just include the parameter value to the base URL of the client. There is, however, a `CookieContainer` instance on the request level. You can either assign the pre-populated container to `request.CookieContainer`, or let the container be created by the request when you call `AddCookie`. Still, the container is only used to extract all the cookies from it and create cookie headers for the request instead of using the container directly. It's because the cookie container is normally configured on the `HttpClientHandler` level and cookies are shared between requests made by the same client. In most of the cases this behaviour can be harmful.
+There is a `CookieContainer` instance on the request level. You can either assign the pre-populated container to `request.CookieContainer`, or let the container be created by the request when you call `AddCookie`. The container is used to extract all the cookies from it and create cookie headers for the request instead of using the container directly. It's because the cookie container is normally configured on the `HttpClientHandler` level and cookies are shared between requests made by the same client. In most of the cases this behaviour can be harmful.
 
-If your use case requires sharing cookies between requests made by the client instance, you can use the client-level `CookieContainer`, which you must provide as the options' property. You can add cookies to the container using the container API. No response cookies, however, would be auto-added to the container, but you can do it in code by getting cookies from the `Cookes` property of the response and adding them to the client-level container available via `IRestClient.Options.CookieContainer` property.
+If your use case requires sharing cookies between requests made by the client instance, you can use the client-level `CookieContainer`, which you must provide as the options' property. You can add cookies to the container using the container API. No response cookies, however, would be auto-added to the container, but you can do it in code by getting cookies from the `Cookies` property of the response and adding them to the client-level container available via `IRestClient.Options.CookieContainer` property.
 
 ### Request Body
 

docs/versioned_docs/version-v111/usage/request.md

@@ -208,11 +208,17 @@ You can add cookies to a request using the `AddCookie` method:
 request.AddCookie("foo", "bar");
 ```
 
+The simple two-parameter form defers domain resolution until execution time — the cookie domain is inferred from the request URL. If you need to specify the path and domain explicitly, use the four-parameter overload:
+
+```csharp
+request.AddCookie("foo", "bar", "/path", "example.com");
+```
+
 RestSharp will add cookies from the request as cookie headers and then extract the matching cookies from the response. You can observe and extract response cookies using the `RestResponse.Cookies` properties, which has the `CookieCollection` type.
 
-However, the usage of a default URL segment parameter is questionable as you can just include the parameter value to the base URL of the client. There is, however, a `CookieContainer` instance on the request level. You can either assign the pre-populated container to `request.CookieContainer`, or let the container be created by the request when you call `AddCookie`. Still, the container is only used to extract all the cookies from it and create cookie headers for the request instead of using the container directly. It's because the cookie container is normally configured on the `HttpClientHandler` level and cookies are shared between requests made by the same client. In most of the cases this behaviour can be harmful.
+There is a `CookieContainer` instance on the request level. You can either assign the pre-populated container to `request.CookieContainer`, or let the container be created by the request when you call `AddCookie`. The container is used to extract all the cookies from it and create cookie headers for the request instead of using the container directly. It's because the cookie container is normally configured on the `HttpClientHandler` level and cookies are shared between requests made by the same client. In most of the cases this behaviour can be harmful.
 
-If your use case requires sharing cookies between requests made by the client instance, you can use the client-level `CookieContainer`, which you must provide as the options' property. You can add cookies to the container using the container API. No response cookies, however, would be auto-added to the container, but you can do it in code by getting cookies from the `Cookes` property of the response and adding them to the client-level container available via `IRestClient.Options.CookieContainer` property.
+If your use case requires sharing cookies between requests made by the client instance, you can use the client-level `CookieContainer`, which you must provide as the options' property. You can add cookies to the container using the container API. No response cookies, however, would be auto-added to the container, but you can do it in code by getting cookies from the `Cookies` property of the response and adding them to the client-level container available via `IRestClient.Options.CookieContainer` property.
 
 ## Request Body
 

docs/versioned_docs/version-v112/usage/request.md

@@ -227,11 +227,17 @@ You can add cookies to a request using the `AddCookie` method:
 request.AddCookie("foo", "bar");
 ```
 
+The simple two-parameter form defers domain resolution until execution time — the cookie domain is inferred from the request URL. If you need to specify the path and domain explicitly, use the four-parameter overload:
+
+```csharp
+request.AddCookie("foo", "bar", "/path", "example.com");
+```
+
 RestSharp will add cookies from the request as cookie headers and then extract the matching cookies from the response. You can observe and extract response cookies using the `RestResponse.Cookies` properties, which has the `CookieCollection` type.
 
-However, the usage of a default URL segment parameter is questionable as you can just include the parameter value to the base URL of the client. There is, however, a `CookieContainer` instance on the request level. You can either assign the pre-populated container to `request.CookieContainer`, or let the container be created by the request when you call `AddCookie`. Still, the container is only used to extract all the cookies from it and create cookie headers for the request instead of using the container directly. It's because the cookie container is normally configured on the `HttpClientHandler` level and cookies are shared between requests made by the same client. In most of the cases this behaviour can be harmful.
+There is a `CookieContainer` instance on the request level. You can either assign the pre-populated container to `request.CookieContainer`, or let the container be created by the request when you call `AddCookie`. The container is used to extract all the cookies from it and create cookie headers for the request instead of using the container directly. It's because the cookie container is normally configured on the `HttpClientHandler` level and cookies are shared between requests made by the same client. In most of the cases this behaviour can be harmful.
 
-If your use case requires sharing cookies between requests made by the client instance, you can use the client-level `CookieContainer`, which you must provide as the options' property. You can add cookies to the container using the container API. No response cookies, however, would be auto-added to the container, but you can do it in code by getting cookies from the `Cookes` property of the response and adding them to the client-level container available via `IRestClient.Options.CookieContainer` property.
+If your use case requires sharing cookies between requests made by the client instance, you can use the client-level `CookieContainer`, which you must provide as the options' property. You can add cookies to the container using the container API. No response cookies, however, would be auto-added to the container, but you can do it in code by getting cookies from the `Cookies` property of the response and adding them to the client-level container available via `IRestClient.Options.CookieContainer` property.
 
 ## Request Body
 

docs/versioned_docs/version-v113/usage/request.md

@@ -227,11 +227,17 @@ You can add cookies to a request using the `AddCookie` method:
 request.AddCookie("foo", "bar");
 ```
 
+The simple two-parameter form defers domain resolution until execution time — the cookie domain is inferred from the request URL. If you need to specify the path and domain explicitly, use the four-parameter overload:
+
+```csharp
+request.AddCookie("foo", "bar", "/path", "example.com");
+```
+
 RestSharp will add cookies from the request as cookie headers and then extract the matching cookies from the response. You can observe and extract response cookies using the `RestResponse.Cookies` properties, which has the `CookieCollection` type.
 
-However, the usage of a default URL segment parameter is questionable as you can just include the parameter value to the base URL of the client. There is, however, a `CookieContainer` instance on the request level. You can either assign the pre-populated container to `request.CookieContainer`, or let the container be created by the request when you call `AddCookie`. Still, the container is only used to extract all the cookies from it and create cookie headers for the request instead of using the container directly. It's because the cookie container is normally configured on the `HttpClientHandler` level and cookies are shared between requests made by the same client. In most of the cases this behaviour can be harmful.
+There is a `CookieContainer` instance on the request level. You can either assign the pre-populated container to `request.CookieContainer`, or let the container be created by the request when you call `AddCookie`. The container is used to extract all the cookies from it and create cookie headers for the request instead of using the container directly. It's because the cookie container is normally configured on the `HttpClientHandler` level and cookies are shared between requests made by the same client. In most of the cases this behaviour can be harmful.
 
-If your use case requires sharing cookies between requests made by the client instance, you can use the client-level `CookieContainer`, which you must provide as the options' property. You can add cookies to the container using the container API. No response cookies, however, would be auto-added to the container, but you can do it in code by getting cookies from the `Cookes` property of the response and adding them to the client-level container available via `IRestClient.Options.CookieContainer` property.
+If your use case requires sharing cookies between requests made by the client instance, you can use the client-level `CookieContainer`, which you must provide as the options' property. You can add cookies to the container using the container API. No response cookies, however, would be auto-added to the container, but you can do it in code by getting cookies from the `Cookies` property of the response and adding them to the client-level container available via `IRestClient.Options.CookieContainer` property.
 
 ## Request Body
 

src/RestSharp/Request/RestRequest.cs

@@ -72,7 +72,8 @@ public RestRequest(string? resource, Method method = Method.Get) : this() {
     public RestRequest(Uri resource, Method method = Method.Get)
         : this(resource.IsAbsoluteUri ? resource.AbsoluteUri : resource.OriginalString, method) { }
 
-    readonly List<FileParameter> _files = [];
+    readonly List<FileParameter> _files   = [];
+    readonly List<Cookie>        _cookies = [];
 
     /// <summary>
     /// Always send a multipart/form-data request - even when no Files are present.
@@ -263,4 +264,8 @@ public RestRequest RemoveParameter(Parameter parameter) {
     }
 
     internal RestRequest AddFile(FileParameter file) => this.With(x => x._files.Add(file));
+
+    internal RestRequest AddCookie(Cookie cookie) => this.With(x => x._cookies.Add(cookie));
+
+    internal IReadOnlyList<Cookie> PendingCookies => _cookies;
 }

src/RestSharp/Request/RestRequestExtensions.cs

@@ -124,6 +124,15 @@ RestRequest RemoveParameter(string? name, ParameterType type) {
             return p != null ? request.RemoveParameter(p) : request;
         }
 
+        /// <summary>
+        /// Adds a cookie to the request. The cookie domain will be inferred from the request URL at execution time.
+        /// </summary>
+        /// <param name="name">Cookie name</param>
+        /// <param name="value">Cookie value</param>
+        /// <returns></returns>
+        public RestRequest AddCookie(string name, string value)
+            => request.AddCookie(new Cookie(name, value));
+
         /// <summary>
         /// Adds cookie to the <seealso cref="HttpClient"/> cookie container.
         /// </summary>

src/RestSharp/RestClient.Async.cs

@@ -130,6 +130,10 @@ async Task<HttpResponse> ExecuteRequestAsync(RestRequest request, CancellationTo
         // Make sure we have a cookie container if not provided in the request
         var cookieContainer = request.CookieContainer ??= new();
 
+        foreach (var cookie in request.PendingCookies) {
+            cookieContainer.Add(url, cookie);
+        }
+
         var headers = new RequestHeaders()
             .AddHeaders(request.Parameters)
             .AddHeaders(DefaultParameters)