diff --git a/example/typescript/src/misskey/authorization.ts b/example/typescript/src/misskey/authorization.ts
index 855edf3..4a66236 100644
--- a/example/typescript/src/misskey/authorization.ts
+++ b/example/typescript/src/misskey/authorization.ts
@@ -43,4 +43,6 @@ client
     console.log(tokenData.refreshToken)
     console.log()
   })
-  .catch((err: Error) => console.error(err))
+  .catch((err: any) => {
+    console.error(err)
+  })
diff --git a/src/mastodon/api_client.ts b/src/mastodon/api_client.ts
index a0f2d2f..e2fbd6b 100644
--- a/src/mastodon/api_client.ts
+++ b/src/mastodon/api_client.ts
@@ -58,70 +58,6 @@ namespace MastodonAPI {
       this.proxyConfig = proxyConfig
     }
 
-    /**
-     * Unauthorized GET request to mastodon REST API.
-     * @param path relative path from baseUrl
-     * @param params Query parameters
-     * @param baseUrl base URL of the target
-     * @param proxyConfig Proxy setting, or set false if don't use proxy.
-     */
-    public static async get<T>(
-      path: string,
-      params = {},
-      baseUrl = this.DEFAULT_URL,
-      proxyConfig: ProxyConfig | false = false
-    ): Promise<Response<T>> {
-      const apiUrl = baseUrl
-      let options: AxiosRequestConfig = {
-        params: params
-      }
-      if (proxyConfig) {
-        options = Object.assign(options, {
-          httpsAgent: proxyAgent(proxyConfig)
-        })
-      }
-      return axios.get<T>(apiUrl + path, options).then((resp: AxiosResponse<T>) => {
-        const res: Response<T> = {
-          data: resp.data,
-          status: resp.status,
-          statusText: resp.statusText,
-          headers: resp.headers
-        }
-        return res
-      })
-    }
-
-    /**
-     * Unauthorized POST request to mastodon REST API.
-     * @param path relative path from baseUrl
-     * @param params Body parameters
-     * @param baseUrl base URL of the target
-     * @param proxyConfig Proxy setting, or set false if don't use proxy.
-     */
-    public static async post<T>(
-      path: string,
-      params = {},
-      baseUrl = this.DEFAULT_URL,
-      proxyConfig: ProxyConfig | false = false
-    ): Promise<Response<T>> {
-      let options: AxiosRequestConfig = {}
-      if (proxyConfig) {
-        options = Object.assign(options, {
-          httpsAgent: proxyAgent(proxyConfig)
-        })
-      }
-      const apiUrl = baseUrl
-      return axios.post<T>(apiUrl + path, params, options).then((resp: AxiosResponse<T>) => {
-        const res: Response<T> = {
-          data: resp.data,
-          status: resp.status,
-          statusText: resp.statusText,
-          headers: resp.headers
-        }
-        return res
-      })
-    }
-
     /**
      * GET request to mastodon REST API.
      * @param path relative path from baseUrl
diff --git a/src/misskey.ts b/src/misskey.ts
index 19cf022..fcb8a76 100644
--- a/src/misskey.ts
+++ b/src/misskey.ts
@@ -104,28 +104,28 @@ export default class Misskey implements MegalodonInterface {
        "secret": "string"
      }
     */
-    return MisskeyAPI.Client.post<MisskeyAPI.Entity.App>('/api/app/create', params, this.baseUrl, this.proxyConfig).then(
-      (res: Response<MisskeyAPI.Entity.App>) => {
-        const appData: OAuth.AppDataFromServer = {
-          id: res.data.id,
-          name: res.data.name,
-          website: null,
-          redirect_uri: res.data.callbackUrl,
-          client_id: '',
-          client_secret: res.data.secret
-        }
-        return OAuth.AppData.from(appData)
+    return this.client.post<MisskeyAPI.Entity.App>('/api/app/create', params).then((res: Response<MisskeyAPI.Entity.App>) => {
+      const appData: OAuth.AppDataFromServer = {
+        id: res.data.id,
+        name: res.data.name,
+        website: null,
+        redirect_uri: res.data.callbackUrl,
+        client_id: '',
+        client_secret: res.data.secret
       }
-    )
+      return OAuth.AppData.from(appData)
+    })
   }
 
   /**
    * POST /api/auth/session/generate
    */
   public async generateAuthUrlAndToken(clientSecret: string): Promise<MisskeyAPI.Entity.Session> {
-    return MisskeyAPI.Client.post<MisskeyAPI.Entity.Session>('/api/auth/session/generate', {
-      appSecret: clientSecret
-    }).then((res: Response<MisskeyAPI.Entity.Session>) => res.data)
+    return this.client
+      .post<MisskeyAPI.Entity.Session>('/api/auth/session/generate', {
+        appSecret: clientSecret
+      })
+      .then((res: Response<MisskeyAPI.Entity.Session>) => res.data)
   }
 
   // ======================================
@@ -155,13 +155,15 @@ export default class Misskey implements MegalodonInterface {
     session_token: string,
     _redirect_uri?: string
   ): Promise<OAuth.TokenData> {
-    return MisskeyAPI.Client.post<MisskeyAPI.Entity.UserKey>('/api/auth/session/userkey', {
-      appSecret: client_secret,
-      token: session_token
-    }).then(res => {
-      const token = new OAuth.TokenData(res.data.accessToken, 'misskey', '', 0, null, null)
-      return token
-    })
+    return this.client
+      .post<MisskeyAPI.Entity.UserKey>('/api/auth/session/userkey', {
+        appSecret: client_secret,
+        token: session_token
+      })
+      .then(res => {
+        const token = new OAuth.TokenData(res.data.accessToken, 'misskey', '', 0, null, null)
+        return token
+      })
   }
 
   public async refreshToken(_client_id: string, _client_secret: string, _refresh_token: string): Promise<OAuth.TokenData> {
diff --git a/src/misskey/api_client.ts b/src/misskey/api_client.ts
index a311cf1..2df4fdf 100644
--- a/src/misskey/api_client.ts
+++ b/src/misskey/api_client.ts
@@ -378,8 +378,6 @@ namespace MisskeyAPI {
    * Usign axios for request, you will handle promises.
    */
   export class Client implements Interface {
-    static DEFAULT_URL = 'https://misskey.io'
-
     private accessToken: string | null
     private baseUrl: string
     private userAgent: string
@@ -400,37 +398,6 @@ namespace MisskeyAPI {
       this.proxyConfig = proxyConfig
     }
 
-    /**
-     * Unauthorized POST request to mastodon REST API.
-     * @param path relative path from baseUrl
-     * @param params Body parameters
-     * @param baseUrl base URL of the target
-     * @param proxyConfig Proxy setting, or set false if don't use proxy.
-     */
-    public static async post<T>(
-      path: string,
-      params = {},
-      baseUrl = this.DEFAULT_URL,
-      proxyConfig: ProxyConfig | false = false
-    ): Promise<Response<T>> {
-      let options: AxiosRequestConfig = {}
-      if (proxyConfig) {
-        options = Object.assign(options, {
-          httpsAgent: proxyAgent(proxyConfig)
-        })
-      }
-      const apiUrl = baseUrl
-      return axios.post<T>(apiUrl + path, params, options).then((resp: AxiosResponse<T>) => {
-        const res: Response<T> = {
-          data: resp.data,
-          status: resp.status,
-          statusText: resp.statusText,
-          headers: resp.headers
-        }
-        return res
-      })
-    }
-
     /**
      * POST request to mastodon REST API.
      * @param path relative path from baseUrl
@@ -438,17 +405,14 @@ namespace MisskeyAPI {
      */
     public async post<T>(path: string, params = {}): Promise<Response<T>> {
       let options: AxiosRequestConfig = {
-        cancelToken: this.cancelTokenSource.token,
-        headers: {
-          'User-Agent': this.userAgent
-        }
+        cancelToken: this.cancelTokenSource.token
       }
       if (this.proxyConfig) {
         options = Object.assign(options, {
           httpsAgent: proxyAgent(this.proxyConfig)
         })
       }
-      let bodyParams = {}
+      let bodyParams = params
       if (this.accessToken) {
         bodyParams = Object.assign(params, {
           i: this.accessToken