diff --git a/CHANGELOG.md b/CHANGELOG.md
index 34d5ab3..ad468cd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## [0.1.2] - 2025-05-09
+
+- Add `Gslide::HTTPError`, `Gslide::UnauthorizedError` and `Gslide::QuotaExceededError` #10
+
 ## [0.1.1] - 2025-04-14
 
 - Use a regular expression for finding a presentation id from url #8
diff --git a/lib/gslide.rb b/lib/gslide.rb
index b522459..96485a0 100644
--- a/lib/gslide.rb
+++ b/lib/gslide.rb
@@ -7,5 +7,7 @@
 
 module Gslide
   class Error < StandardError; end
-
+  class HTTPError < Error; end
+  class UnauthorizedError < HTTPError; end
+  class QuotaExceededError < HTTPError; end
 end
diff --git a/lib/gslide/concerns/requests.rb b/lib/gslide/concerns/requests.rb
index b7be051..b9055e5 100644
--- a/lib/gslide/concerns/requests.rb
+++ b/lib/gslide/concerns/requests.rb
@@ -7,9 +7,21 @@ def get_request(uri, auth_token: "")
         req = Net::HTTP::Get.new(uri.to_s)
         req['Authorization'] = "Bearer #{auth_token}"
 
-        Net::HTTP.start(uri.host, uri.port, :use_ssl => uri.scheme == 'https') do |http|
+        res = Net::HTTP.start(uri.host, uri.port, :use_ssl => uri.scheme == 'https') do |http|
           http.request(req)
         end
+        response_body = JSON(res.body)
+
+        case res
+        when Net::HTTPSuccess
+          response_body
+        when Net::HTTPUnauthorized
+          msg = response_body["error"] ? response_body["error"]["message"] : "Unauthorized"
+          raise Gslide::UnauthorizedError, msg
+        else
+          msg = response_body["error"] ? response_body["error"]["message"] : "HTTPError"
+          raise Gslide::HTTPError, msg
+        end
       end
 
       def post_request(uri, auth_token: "", body: {})
@@ -19,9 +31,29 @@ def post_request(uri, auth_token: "", body: {})
 
         req.body = body
 
-        Net::HTTP.start(uri.host, uri.port, :use_ssl => uri.scheme == 'https') do |http|
+        res = Net::HTTP.start(uri.host, uri.port, :use_ssl => uri.scheme == 'https') do |http|
           http.request(req)
         end
+
+        response_body = JSON(res.body)
+
+        case res
+        when Net::HTTPSuccess
+          response_body
+        when Net::HTTPUnauthorized
+          msg = response_body["error"] ? response_body["error"]["message"] : "Unauthorized"
+          raise Gslide::UnauthorizedError, msg
+        when Net::HTTPTooManyRequests
+          # "Quota exceeded for quota metric 'Write requests' and limit 'Write requests per minute per user' of service 'slides.googleapis.com' for consumer 'project_number:012345678901'."
+          if response_body["error"] && response_body["error"]["message"] =~ /Quota exceeded/
+            raise Gslide::QuotaExceededError, msg
+          else
+            raise Gslide::HTTPError, msg || "TooManyRequests"
+          end
+        else
+          msg = response_body["error"] ? response_body["error"]["message"] : "HTTPError"
+          raise Gslide::HTTPError, msg
+        end
       end
     end
   end
diff --git a/lib/gslide/models/editor.rb b/lib/gslide/models/editor.rb
index b49c32a..8a09258 100644
--- a/lib/gslide/models/editor.rb
+++ b/lib/gslide/models/editor.rb
@@ -23,12 +23,7 @@ def insert_presentation(options = {})
         uri = URI(GOOGLE_SLIDES + "")
 
         # "title" is the only allowed field in the request body
-        res = post_request(uri, auth_token: @token, body: options.to_json)
-        response_body = JSON(res.body)
-
-        if response_body["error"]
-          raise Gslide::Error.new(response_body["error"]["message"])
-        end
+        response_body = post_request(uri, auth_token: @token, body: options.to_json)
         Presentation.new response_body["presentationId"], auth: self
       end
     end
diff --git a/lib/gslide/models/presentation.rb b/lib/gslide/models/presentation.rb
index 325d18a..055dd4c 100644
--- a/lib/gslide/models/presentation.rb
+++ b/lib/gslide/models/presentation.rb
@@ -19,8 +19,8 @@ def initialize(id_or_url, auth: nil)
       def get
         uri = URI(GOOGLE_SLIDES + "/#{@id}")
 
-        res = get_request(uri, auth_token: @auth.token)
-        JSON(res.body).convert_keys {|k| k.snake_case.to_sym }
+        response_body = get_request(uri, auth_token: @auth.token)
+        response_body.convert_keys {|k| k.snake_case.to_sym }
       end
 
       def link_url
@@ -36,23 +36,16 @@ def batch_update(options = {})
         uri = URI(GOOGLE_SLIDES + "/#{@id}:batchUpdate")
         request_body = options.convert_keys { |k| k.to_s.lower_camel_case }.to_json
 
-        res = post_request(uri, auth_token: @auth.token, body: request_body)
-        response_body = JSON(res.body)
-
-        if response_body["error"]
-          raise Gslide::Error.new(response_body["error"]["message"])
-        end
+        response_body = post_request(uri, auth_token: @auth.token, body: request_body)
         response_body["presentationId"] == @id
-
-      rescue Gslide::Error => e
-        if e.message =~ /Quota exceeded/ && (retries += 1) < 3
-          # "Quota exceeded for quota metric 'Write requests' and limit 'Write requests per minute per user' of service 'slides.googleapis.com' for consumer 'project_number:012345678901'."
+      rescue Gslide::QuotaExceededError
+        if (retries += 1) < 3
           sleep 10 + retries * retries * 10
 
           retry
         end
-        # all retries failed, re-raise exception
-        raise e
+        # all retries failed, raise exception
+        raise
       end
 
       def get_slide_ids
diff --git a/lib/gslide/models/spreadsheet.rb b/lib/gslide/models/spreadsheet.rb
index 3fc56ae..7f6c44d 100644
--- a/lib/gslide/models/spreadsheet.rb
+++ b/lib/gslide/models/spreadsheet.rb
@@ -17,8 +17,8 @@ def initialize(id, auth: nil)
       def get
         uri = URI(GOOGLE_SHEETS + "/#{@id}")
 
-        res = get_request(uri, auth_token: @auth.token)
-        JSON(res.body).convert_keys {|k| k.snake_case.to_sym }
+        response_body = get_request(uri, auth_token: @auth.token)
+        response_body.convert_keys {|k| k.snake_case.to_sym }
       end
 
       def link_url
@@ -32,12 +32,7 @@ def batch_update(options = {})
         uri = URI(GOOGLE_SHEETS + "/#{@id}:batchUpdate")
         request_body = options.convert_keys { |k| k.to_s.lower_camel_case }.to_json
 
-        res = post_request(uri, auth_token: @auth.token, body: request_body)
-        response_body = JSON(res.body)
-
-        if response_body["error"]
-          raise Gslide::Error.new(response_body["error"]["message"])
-        end
+        response_body = post_request(uri, auth_token: @auth.token, body: request_body)
         response_body["spreadsheetId"] == @id
       end
 
@@ -58,11 +53,8 @@ def create(options = {})
         request_body = options.convert_keys { |k| k.to_s.lower_camel_case }.to_json
 
         uri = URI(GOOGLE_SHEETS)
-        res = post_request(uri, auth_token: @auth.token, body: request_body)
-        response_body = JSON(res.body)
-        if response_body["error"]
-          raise Gslide::Error.new(response_body["error"]["message"])
-        end
+        response_body = post_request(uri, auth_token: @auth.token, body: request_body)
+
         spreadsheet_id = response_body["spreadsheetId"]
         Spreadsheet.new(spreadsheet_id, auth: @auth)
       end
diff --git a/lib/gslide/version.rb b/lib/gslide/version.rb
index 40bc4cf..85d7498 100644
--- a/lib/gslide/version.rb
+++ b/lib/gslide/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Gslide
-  VERSION = "0.1.1"
+  VERSION = "0.1.2"
 end