diff --git a/httpie/cli/nested_json/parse.py b/httpie/cli/nested_json/parse.py
index 323a22eef1..9792c9c0f9 100644
--- a/httpie/cli/nested_json/parse.py
+++ b/httpie/cli/nested_json/parse.py
@@ -137,8 +137,8 @@ def send_buffer() -> Iterator[Token]:
         value = ''.join(buffer)
         kind = TokenKind.TEXT
         if not backslashes:
-            for variation, kind in [
-                (int, TokenKind.NUMBER),
+            for variation, variation_kind in [
+                (canonical_int, TokenKind.NUMBER),
                 (check_escaped_int, TokenKind.TEXT),
             ]:
                 try:
@@ -146,6 +146,7 @@ def send_buffer() -> Iterator[Token]:
                 except ValueError:
                     continue
                 else:
+                    kind = variation_kind
                     break
         yield Token(
             kind=kind,
@@ -189,5 +190,20 @@ def check_escaped_int(value: str) -> str:
         return value[1:]
 
 
+def canonical_int(value: str) -> int:
+    """Convert to int only when the value has no leading zeros.
+
+    A literal such as ``01`` is a valid JSON *key*, not a number - JSON
+    numbers can't have leading zeros. Coercing it to ``int`` silently
+    rewrites the key to ``1`` and can collide with a real ``1`` key.
+    """
+    if not value:
+        raise ValueError('Not an int')
+    converted = int(value)
+    if str(converted) != value:
+        raise ValueError('Not a canonical int')
+    return converted
+
+
 def assert_cant_happen():
     raise ValueError('Unexpected value')
diff --git a/httpie/output/writer.py b/httpie/output/writer.py
index 4a2949bce2..136f0abac7 100644
--- a/httpie/output/writer.py
+++ b/httpie/output/writer.py
@@ -167,7 +167,7 @@ def get_stream_type_and_kwargs(
         raw_content_type_header = headers.get('Content-Type', None)
         if raw_content_type_header:
             content_type_header, _ = parse_content_type_header(raw_content_type_header)
-            is_stream = (content_type_header == 'text/event-stream')
+            is_stream = (content_type_header.lower() == 'text/event-stream')
 
     if not env.stdout_isatty and not prettify_groups:
         stream_class = RawStream
diff --git a/tests/test_json.py b/tests/test_json.py
index e758ebe7f4..656e7e1c92 100644
--- a/tests/test_json.py
+++ b/tests/test_json.py
@@ -172,6 +172,16 @@ def test_complex_json_arguments_with_non_json(httpbin, request_type, value):
             ],
             {'bottle-on-wall': [1, 2, 3]},
         ),
+        (
+            # Leading-zero keys stay keys and don't collide with '1'
+            ['01=x', '1=y'],
+            {'01': 'x', '1': 'y'},
+        ),
+        (
+            # ...but canonical integers still become numeric indices in paths
+            ['kids[0]=Thelma', 'kids[10]=Ashley'],
+            {'kids': ['Thelma', None, None, None, None, None, None, None, None, None, 'Ashley']},
+        ),
         (
             [
                 'pet[species]=Dahut',
diff --git a/tests/test_stream.py b/tests/test_stream.py
index b0b9b8bde8..d9647fca96 100644
--- a/tests/test_stream.py
+++ b/tests/test_stream.py
@@ -128,6 +128,10 @@ def test_redirected_stream(httpbin):
         ['Accept:text/event-stream; charset=utf-8'],
         3
     ),
+    (
+        ['Accept:Text/Event-Stream'],
+        3
+    ),
     (
         ['Accept:text/plain'],
         1