Added extensions for getting content header values (#2247)

src/RestSharp/Response/RestResponseExtensions.cs

@@ -22,7 +22,7 @@ public static class RestResponseExtensions {
  /// <param name="headerName">Name of the header</param>
  /// <returns>Header value or null if the header is not found in the response</returns>
  public static string? GetHeaderValue(this RestResponse response, string headerName)
- => response.Headers?.FirstOrDefault(x => NameIs(x.Name, headerName))?.Value?.ToString();
+ => response.Headers?.FirstOrDefault(x => NameIs(x.Name, headerName))?.Value.ToString();
 
  /// <summary>
  /// Gets all the values of the header with the specified name.
@@ -33,7 +33,29 @@ public static class RestResponseExtensions {
  public static string[] GetHeaderValues(this RestResponse response, string headerName)
  => response.Headers
  ?.Where(x => NameIs(x.Name, headerName))
- .Select(x => x.Value?.ToString() ?? "")
+ .Select(x => x.Value.ToString() ?? "")
+ .ToArray() ??
+ [];
+
+ /// <summary>
+ /// Gets the value of the content header with the specified name.
+ /// </summary>
+ /// <param name="response">Response object</param>
+ /// <param name="headerName">Name of the header</param>
+ /// <returns>Header value or null if the content header is not found in the response</returns>
+ public static string? GetContentHeaderValue(this RestResponse response, string headerName)
+ => response.ContentHeaders?.FirstOrDefault(x => NameIs(x.Name, headerName))?.Value.ToString();
+
+ /// <summary>
+ /// Gets all the values of the content header with the specified name.
+ /// </summary>
+ /// <param name="response">Response object</param>
+ /// <param name="headerName">Name of the header</param>
+ /// <returns>Array of header values or empty array if the content header is not found in the response</returns>
+ public static string[] GetContentHeaderValues(this RestResponse response, string headerName)
+ => response.ContentHeaders
+ ?.Where(x => NameIs(x.Name, headerName))
+ .Select(x => x.Value.ToString() ?? "")
  .ToArray() ??
  [];