feat: ability to override content type

lib/consts.dart

@@ -305,6 +305,8 @@ const kTypeVideo = 'video';
 
 const kSubTypeDefaultViewOptions = 'all';
 
+const kContentType = 'Content-Type';
+
 const kContentTypeMap = {
   ContentType.json: "$kTypeApplication/$kSubTypeJson",
   ContentType.text: "$kTypeText/$kSubTypePlain",

lib/screens/home_page/editor_pane/details_card/request_pane/request_headers.dart

@@ -1,4 +1,5 @@
 import 'dart:math';
+import 'package:apidash/utils/header_utils.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:davi/davi.dart';
@@ -78,6 +79,23 @@ class EditRequestHeadersState extends ConsumerState<EditRequestHeaders> {
           grow: 1,
           cellBuilder: (_, row) {
             int idx = row.index;
+
+            if (row.data.name == kContentType) {
+               return HeaderField(
+                keyId: "$activeId-$idx-headers-v-$seed",
+                initialValue: rows[idx].value,
+                hintText: " Add Header Value",
+                onChanged: (value) {
+                  rows[idx] = rows[idx].copyWith(value: value);
+                  _onFieldChange(activeId!);
+                },
+                headerSuggestionsCallback: (pattern) {
+                  return getHeaderValueSuggestions(pattern);
+                },
+                colorScheme: Theme.of(context).colorScheme,
+              );
+            }
+
             return CellField(
               keyId: "$activeId-$idx-headers-v-$seed",
               initialValue: rows[idx].value,

lib/utils/header_utils.dart

@@ -15,6 +15,7 @@ Map<String, String> headers = {
       "Indicates the encoding transformations that have been applied to the entity body of the response.",
   "Content-Security-Policy":
       "Controls the sources from which content can be loaded on a web page to mitigate various types of attacks.",
+  "Content-Type": "Indicates the original media type of the resource (prior to any content encoding applied for sending)",
   "Cookie": "Used to send previously stored cookies back to the server.",
   "Cross-Origin-Embedder-Policy":
       "Controls whether a document is allowed to be embedded in another document.",
@@ -70,3 +71,13 @@ List<String> getHeaderSuggestions(String pattern) {
       )
       .toList();
 }
+
+List<String> headerValues = ['application/json', 'text/plain'];
+
+List<String> getHeaderValueSuggestions(String pattern) {
+  return headerValues
+      .where(
+        (element) => element.contains(pattern.toLowerCase()),
+      )
+      .toList();
+}

lib/widgets/headerfield.dart

@@ -1,3 +1,5 @@
+import 'dart:async';
+
 import 'package:apidash/utils/header_utils.dart';
 import 'package:flutter/material.dart';
 import 'package:apidash/consts.dart';
@@ -10,12 +12,14 @@ class HeaderField extends StatefulWidget {
     this.hintText,
     this.initialValue,
     this.onChanged,
+    this.headerSuggestionsCallback,
     this.colorScheme,
   });
   final String keyId;
   final String? hintText;
   final String? initialValue;
   final void Function(String)? onChanged;
+  final FutureOr<Iterable<String>> Function(String)? headerSuggestionsCallback;
   final ColorScheme? colorScheme;
 
   @override
@@ -67,7 +71,7 @@ class _HeaderFieldState extends State<HeaderField> {
           title: Text(suggestion),
         );
       },
-      suggestionsCallback: headerSuggestionCallback,
+      suggestionsCallback: widget.headerSuggestionsCallback ?? headerSuggestionCallback,
       suggestionsBoxDecoration: suggestionBoxDecorations(context),
       textFieldConfiguration: TextFieldConfiguration(
         onChanged: widget.onChanged,