优先从github获取meta

FastGithub.Scanner/DomainAddressProviders/GithubMetaProvider.cs

@@ -20,6 +20,7 @@ namespace FastGithub.Scanner.DomainAddressProviders
     {
         private readonly IOptionsMonitor<GithubOptions> options;
         private readonly ILogger<GithubMetaProvider> logger;
+        private const string META_URI = "https://api.github.com/meta";
 
         /// <summary>
         /// Github公开的域名与ip关系提供者
@@ -49,7 +50,7 @@ namespace FastGithub.Scanner.DomainAddressProviders
             try
             {
                 using var httpClient = new HttpClient();
-                var meta = await httpClient.GetFromJsonAsync<Meta>(setting.MetaUri);
+                var meta = await this.GetMetaAsync(httpClient, setting.MetaUri);
                 if (meta != null)
                 {
                     return meta.ToDomainAddresses();
@@ -63,6 +64,25 @@ namespace FastGithub.Scanner.DomainAddressProviders
             return Enumerable.Empty<DomainAddress>();
         }
 
+
+        /// <summary>
+        /// 尝试获取meta
+        /// </summary>
+        /// <param name="httpClient"></param>
+        /// <param name="metaUri"></param>
+        /// <returns></returns>
+        private async Task<Meta?> GetMetaAsync(HttpClient httpClient, Uri metaUri)
+        {
+            try
+            {
+                return await httpClient.GetFromJsonAsync<Meta>(META_URI);
+            }
+            catch (Exception)
+            {
+                return await httpClient.GetFromJsonAsync<Meta>(metaUri);
+            }
+        }
+
         /// <summary>
         /// github的meta结构
         /// </summary>

FastGithub/appsettings.json

@@ -13,7 +13,6 @@
     "DominAddressProviders": {
       "GithubMetaProvider": {
         "Enable": true, 
-        // "MetaUri": "https://api.github.com/meta", // meta×ÊÔ´uri  
         "MetaUri": "https://gitee.com/jiulang/fast-github/raw/master/FastGithub/meta.json"
       },
       "IPAddressComProvider": {