added: more common HTTP headers suggestions

lib/utils/header_utils.dart

@@ -14,15 +14,21 @@ Map<String, String> headers = {
       "Used in preflight requests during CORS to specify the headers that will be included in the actual request.",
   "Access-Control-Request-Method":
       "Used in preflight requests during CORS to indicate the HTTP method that will be used in the actual request.",
+  "Accept-Language":
+      "Specifies the preferred natural language and locale for the response.",
   "Authorization":
       "Contains credentials for authenticating the client with the server.",
   "Authorization Bearer Token": "Often used for token-based authentication.",
   "Cache-Control":
       "Provides directives for caching mechanisms in both requests and responses.",
+  "Connection":
+      "Informs whether the connection stays open or close after the current transaction finishes.",
   "Content-Disposition":
       "Specifies the presentation style (inline or attachment) of the response.",
   "Content-Encoding":
       "Indicates the encoding transformations that have been applied to the entity body of the response.",
+  "Content-Length":
+      "Indicates the size of the message body sent to the recipient in bytes.",
   "Content-Security-Policy":
       "Controls the sources from which content can be loaded on a web page to mitigate various types of attacks.",
   "Content-Type":
@@ -34,6 +40,7 @@ Map<String, String> headers = {
       "Controls which documents are allowed to open a new window or access the current window.",
   "Cross-Origin-Resource-Policy":
       "Controls how cross-origin requests for resources are handled.",
+  "Date": "Indicates the date and time at which the message was sent.",
   "DNT":
       "Informs websites whether the user's preference is to opt out of online tracking.",
   "Expect": "Indicates certain expectations that need to be met by the server.",
@@ -50,6 +57,8 @@ Map<String, String> headers = {
       "Used in conjunction with the Range header to conditionally request a partial resource.",
   "If-Unmodified-Since":
       "Used for conditional requests, allows the server to respond based on certain conditions.",
+  "Location":
+      "Indicates the URL a client should redirect to for further interaction.",
   "Origin": "Specifies the origin of a cross-origin request.",
   "Range":
       "Used to request only part of a resource, typically in the context of downloading large files.",
@@ -59,6 +68,7 @@ Map<String, String> headers = {
       "Specifies how much information the browser should include in the Referer header when navigating to other pages.",
   "Retry-After":
       "Informs the client how long it should wait before making another request after a server has responded with a rate-limiting status code.",
+  "Server": "Indicates the software used by the origin server.",
   "Strict-Transport-Security":
       "Instructs the browser to always use HTTPS for the given domain.",
   "TE": "Specifies the transfer encodings that are acceptable to the client.",
@@ -67,10 +77,14 @@ Map<String, String> headers = {
   "Via":
       "Indicates intermediate proxies or gateways through which the request or response has passed.",
   "X-Api-Key": "Used to authenticate requests to an API with an API key.",
+  "X-Content-Type-Options":
+      "Used to prevent browsers from MIME-sniffing a response.",
   "X-CSRF-Token":
       "Used for protection against Cross-Site Request Forgery (CSRF) attacks.",
   "X-Forwarded-For":
       "Identifies the client's original IP address when behind a proxy or load balancer.",
+  "X-Frame-Options":
+      "Controls whether a webpage can be displayed within an iframe or other embedded frame elements.",
   "X-Requested-With":
       "Indicates whether the request was made with JavaScript using XMLHttpRequest.",
   "X-XSS-Protection":