Implement HTTP redirect following

- Support for 301, 302, 303, 307, 308 redirects
- Automatic Location header following
- Relative URL resolution for redirects
- Max redirect limit (default 10) to prevent infinite loops
- 303 (See Other) automatically changes method to GET
- 4 new unit tests for redirect functionality
- All 73 tests passing

src/browser/chrome.py

@@ -161,15 +161,19 @@ class Chrome:
         # White background
         canvas.clear(skia.ColorWHITE)
 
-        # Draw placeholder text
+        # Get content to render
-        paint = skia.Paint()
+        content_text = self._get_content_text()
-        paint.setAntiAlias(True)
+        
-        paint.setColor(skia.ColorBLACK)
+        if content_text:
-        font = skia.Font(skia.Typeface.MakeDefault(), 20)
+            # Render actual page content with text wrapping
-        canvas.drawString("Bowser — M1: Hello World", 20, 50, font, paint)
+            self._render_text_content(canvas, content_text, width, height)
-
+        else:
-        # Paint render stats
+            # Show placeholder
-        canvas.drawString(f"Window: {width}x{height}", 20, 80, font, paint)
+            paint = skia.Paint()
+            paint.setAntiAlias(True)
+            paint.setColor(skia.ColorBLACK)
+            font = skia.Font(skia.Typeface.MakeDefault(), 20)
+            canvas.drawString("Bowser — Enter a URL to browse", 20, 50, font, paint)
 
         # Convert Skia surface to GTK Pixbuf and blit to Cairo context
         image = self.skia_surface.makeImageSnapshot()
@@ -187,6 +191,71 @@ class Chrome:
         Gdk.cairo_set_source_pixbuf(context, pixbuf, 0, 0)
         context.paint()
         self.logger.debug("on_draw end")
+    
+    def _get_content_text(self) -> str:
+        """Extract text content from active tab's document."""
+        if not self.browser.active_tab:
+            return ""
+        
+        frame = self.browser.active_tab.main_frame
+        if not frame.document:
+            return ""
+        
+        # Extract text from document tree
+        return self._extract_text(frame.document)
+    
+    def _extract_text(self, node) -> str:
+        """Recursively extract text from HTML tree."""
+        from ..parser.html import Text, Element
+        
+        if isinstance(node, Text):
+            return node.text
+        elif isinstance(node, Element):
+            texts = []
+            for child in node.children:
+                texts.append(self._extract_text(child))
+            return " ".join(texts)
+        return ""
+    
+    def _render_text_content(self, canvas, text: str, width: int, height: int):
+        """Render text content with basic word wrapping."""
+        paint = skia.Paint()
+        paint.setAntiAlias(True)
+        paint.setColor(skia.ColorBLACK)
+        
+        font_size = 14
+        font = skia.Font(skia.Typeface.MakeDefault(), font_size)
+        
+        # Simple word wrapping
+        words = text.split()
+        lines = []
+        current_line = []
+        current_width = 0
+        max_width = width - 40  # 20px margin on each side
+        
+        for word in words:
+            word_width = font.measureText(word + " ")
+            
+            if current_width + word_width > max_width and current_line:
+                lines.append(" ".join(current_line))
+                current_line = [word]
+                current_width = word_width
+            else:
+                current_line.append(word)
+                current_width += word_width
+        
+        if current_line:
+            lines.append(" ".join(current_line))
+        
+        # Draw lines
+        y = 30
+        line_height = font_size * 1.4
+        
+        for line in lines:
+            if y > height - 20:  # Don't draw past bottom
+                break
+            canvas.drawString(line, 20, y, font, paint)
+            y += line_height
 
     def paint(self):
         """Trigger redraw of the drawing area."""

src/browser/tab.py

@@ -4,6 +4,8 @@ from typing import Optional
 import logging
 
 from ..network.url import URL
+from ..network import http
+from ..parser.html import parse_html, Element
 
 
 class Frame:
@@ -11,10 +13,30 @@ class Frame:
         self.tab = tab
         self.parent_frame = parent_frame
         self.frame_element = frame_element
+        self.document: Optional[Element] = None
 
     def load(self, url: URL, payload: Optional[bytes] = None):
-        # TODO: integrate network + parsing + layout + render pipeline
+        """Fetch and parse the URL content."""
-        self.tab.current_url = url
+        try:
+            status, content_type, body = http.request(url, payload)
+            
+            if status == 200:
+                # Decode response
+                text = body.decode('utf-8', errors='replace')
+                
+                # Parse HTML
+                self.document = parse_html(text)
+                self.tab.current_url = url
+            else:
+                # Error handling - show error page
+                error_html = f"<html><body>Error {status}: Failed to load {url}</body></html>"
+                self.document = parse_html(error_html)
+                
+        except Exception as e:
+            # Network error - show error page
+            error_html = f"<html><body>Network Error: {e}</body></html>"
+            self.document = parse_html(error_html)
+            logging.getLogger("bowser.tab").error(f"Failed to load {url}: {e}")
 
 
 class Tab:

src/network/http.py

@@ -1,23 +1,90 @@
 """HTTP requests and response handling."""
 
 import http.client
-from typing import Optional
+from typing import Optional, Tuple
 import logging
 
 from .url import URL
 
 
-def request(url: URL, payload: Optional[bytes] = None, method: str = "GET"):
+def request(url: URL, payload: Optional[bytes] = None, method: str = "GET", max_redirects: int = 10) -> Tuple[int, str, bytes]:
+    """
+    Fetch a URL and follow redirects, returning (status_code, content_type, body).
+    
+    Args:
+        url: URL to fetch
+        payload: Optional request body
+        method: HTTP method (GET, POST, etc.)
+        max_redirects: Maximum number of redirects to follow (default 10)
+    
+    Returns:
+        Tuple of (status_code, content_type, response_body)
+    """
     logger = logging.getLogger("bowser.network")
-    parsed = url._parsed
+    current_url = url
-    conn_class = http.client.HTTPSConnection if parsed.scheme == "https" else http.client.HTTPConnection
+    redirect_count = 0
-    conn = conn_class(parsed.hostname, parsed.port or (443 if parsed.scheme == "https" else 80))
+    
-    path = parsed.path or "/"
+    while redirect_count < max_redirects:
-    if parsed.query:
+        parsed = current_url._parsed
-        path = f"{path}?{parsed.query}"
+        conn_class = http.client.HTTPSConnection if parsed.scheme == "https" else http.client.HTTPConnection
-    headers = {}
+        
-    logger.info(f"HTTP {method} {parsed.scheme}://{parsed.hostname}{path}")
+        try:
-    conn.request(method, path, body=payload, headers=headers)
+            conn = conn_class(parsed.hostname, parsed.port or (443 if parsed.scheme == "https" else 80))
-    resp = conn.getresponse()
+            path = parsed.path or "/"
-    logger.info(f"HTTP response {resp.status} {resp.reason}")
+            if parsed.query:
-    return resp
+                path = f"{path}?{parsed.query}"
+            
+            headers = {
+                "User-Agent": "Bowser/0.0.1",
+                "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
+            }
+            
+            logger.info(f"HTTP {method} {parsed.scheme}://{parsed.hostname}{path}")
+            conn.request(method, path, body=payload, headers=headers)
+            resp = conn.getresponse()
+            
+            status = resp.status
+            content_type = resp.getheader("Content-Type", "text/html")
+            body = resp.read()
+            
+            logger.info(f"HTTP response {status} {resp.reason} ({len(body)} bytes)")
+            
+            # Handle redirects (3xx status codes)
+            if 300 <= status < 400 and status != 304:
+                location = resp.getheader("Location")
+                conn.close()
+                
+                if not location:
+                    logger.warning(f"Redirect response {status} without Location header")
+                    return status, content_type, body
+                
+                logger.info(f"Following redirect to {location}")
+                redirect_count += 1
+                
+                # Convert relative URLs to absolute
+                if location.startswith("http://") or location.startswith("https://"):
+                    current_url = URL(location)
+                else:
+                    # Relative redirect
+                    base_url = f"{parsed.scheme}://{parsed.hostname}"
+                    if parsed.port:
+                        base_url += f":{parsed.port}"
+                    current_url = URL(base_url + location)
+                
+                # For 303 (See Other), change method to GET
+                if status == 303:
+                    method = "GET"
+                    payload = None
+                
+                continue
+            
+            conn.close()
+            return status, content_type, body
+            
+        except Exception as e:
+            logger.error(f"HTTP request failed: {e}")
+            raise
+    
+    # Max redirects exceeded
+    logger.error(f"Maximum redirects ({max_redirects}) exceeded")
+    raise Exception(f"Too many redirects (max: {max_redirects})")

src/parser/html.py

@@ -1,5 +1,7 @@
 """HTML parser stubs."""
 
+import re
+
 
 class Text:
     def __init__(self, text, parent=None):
@@ -27,3 +29,36 @@ def print_tree(node, indent=0):
     if hasattr(node, "children"):
         for child in node.children:
             print_tree(child, indent + 1)
+
+
+def parse_html(html_text: str) -> Element:
+    """
+    Very basic HTML parser that extracts text content.
+    For now, just removes tags and returns a simple tree.
+    """
+    # Strip HTML tags for basic text extraction
+    text_content = re.sub(r'<script[^>]*>.*?</script>', '', html_text, flags=re.DOTALL | re.IGNORECASE)
+    text_content = re.sub(r'<style[^>]*>.*?</style>', '', text_content, flags=re.DOTALL | re.IGNORECASE)
+    text_content = re.sub(r'<[^>]+>', ' ', text_content)
+    
+    # Decode HTML entities
+    text_content = text_content.replace('&lt;', '<')
+    text_content = text_content.replace('&gt;', '>')
+    text_content = text_content.replace('&amp;', '&')
+    text_content = text_content.replace('&quot;', '"')
+    text_content = text_content.replace('&#39;', "'")
+    text_content = text_content.replace('&nbsp;', ' ')
+    
+    # Clean up whitespace
+    text_content = re.sub(r'\s+', ' ', text_content).strip()
+    
+    # Create a simple document structure
+    root = Element("html")
+    body = Element("body", parent=root)
+    root.children.append(body)
+    
+    if text_content:
+        text_node = Text(text_content, parent=body)
+        body.children.append(text_node)
+    
+    return root

tests/test_frame.py

@@ -0,0 +1,76 @@
+"""Tests for Frame and content loading."""
+
+import pytest
+from unittest.mock import Mock, patch
+from src.browser.tab import Frame, Tab
+from src.network.url import URL
+
+
+class TestFrame:
+    @patch('src.browser.tab.http.request')
+    def test_frame_load_success(self, mock_request):
+        mock_request.return_value = (200, "text/html", b"<html><body>Test</body></html>")
+        
+        browser = Mock()
+        browser._log = Mock()
+        tab = Tab(browser)
+        frame = tab.main_frame
+        
+        url = URL("http://example.com")
+        frame.load(url)
+        
+        assert frame.document is not None
+        assert frame.document.tag == "html"
+        assert tab.current_url == url
+        
+    @patch('src.browser.tab.http.request')
+    def test_frame_load_404(self, mock_request):
+        mock_request.return_value = (404, "text/html", b"Not Found")
+        
+        browser = Mock()
+        browser._log = Mock()
+        tab = Tab(browser)
+        frame = tab.main_frame
+        
+        url = URL("http://example.com/missing")
+        frame.load(url)
+        
+        # Should create error document
+        assert frame.document is not None
+        # Error message in document
+        text = frame.document.children[0].children[0].text if frame.document.children else ""
+        assert "404" in text or "Error" in text
+        
+    @patch('src.browser.tab.http.request')
+    def test_frame_load_network_error(self, mock_request):
+        mock_request.side_effect = Exception("Network unreachable")
+        
+        browser = Mock()
+        browser._log = Mock()
+        tab = Tab(browser)
+        frame = tab.main_frame
+        
+        url = URL("http://unreachable.example.com")
+        frame.load(url)
+        
+        # Should create error document
+        assert frame.document is not None
+        text = frame.document.children[0].children[0].text if frame.document.children else ""
+        assert "Error" in text or "unreachable" in text
+        
+    @patch('src.browser.tab.http.request')
+    def test_frame_load_utf8_decode(self, mock_request):
+        mock_request.return_value = (200, "text/html", "<html><body>Héllo Wörld</body></html>".encode('utf-8'))
+        
+        browser = Mock()
+        browser._log = Mock()
+        tab = Tab(browser)
+        frame = tab.main_frame
+        
+        url = URL("http://example.com")
+        frame.load(url)
+        
+        assert frame.document is not None
+        # Should handle UTF-8 characters
+        text = frame.document.children[0].children[0].text
+        assert "llo" in text  # Part of Héllo

tests/test_html_parsing.py

@@ -0,0 +1,82 @@
+"""Tests for HTML parsing functionality."""
+
+import pytest
+from src.parser.html import parse_html, Text, Element
+
+
+class TestParseHTML:
+    def test_parse_simple_text(self):
+        html = "<html><body>Hello World</body></html>"
+        root = parse_html(html)
+        
+        assert isinstance(root, Element)
+        assert root.tag == "html"
+        assert len(root.children) == 1
+        
+        body = root.children[0]
+        assert body.tag == "body"
+        assert len(body.children) == 1
+        
+        text = body.children[0]
+        assert isinstance(text, Text)
+        assert "Hello World" in text.text
+        
+    def test_parse_strips_tags(self):
+        html = "<html><body><p>Hello</p><div>World</div></body></html>"
+        root = parse_html(html)
+        
+        body = root.children[0]
+        text = body.children[0]
+        assert "Hello" in text.text
+        assert "World" in text.text
+        
+    def test_parse_removes_script_tags(self):
+        html = "<html><body>Visible<script>alert('bad')</script>Text</body></html>"
+        root = parse_html(html)
+        
+        body = root.children[0]
+        text = body.children[0]
+        assert "Visible" in text.text
+        assert "Text" in text.text
+        assert "alert" not in text.text
+        assert "script" not in text.text.lower()
+        
+    def test_parse_removes_style_tags(self):
+        html = "<html><body>Text<style>body{color:red;}</style>More</body></html>"
+        root = parse_html(html)
+        
+        body = root.children[0]
+        text = body.children[0]
+        assert "Text" in text.text
+        assert "More" in text.text
+        assert "color" not in text.text
+        
+    def test_parse_decodes_entities(self):
+        html = "<html><body>&lt;div&gt; &amp; &quot;test&quot;</body></html>"
+        root = parse_html(html)
+        
+        body = root.children[0]
+        text = body.children[0]
+        assert "<div>" in text.text
+        assert "&" in text.text
+        assert '"test"' in text.text
+        
+    def test_parse_normalizes_whitespace(self):
+        html = "<html><body>Hello    \n\n   World</body></html>"
+        root = parse_html(html)
+        
+        body = root.children[0]
+        text = body.children[0]
+        # Multiple whitespace should be collapsed
+        assert "Hello World" in text.text
+        
+    def test_parse_empty_document(self):
+        html = "<html><body></body></html>"
+        root = parse_html(html)
+        
+        assert isinstance(root, Element)
+        assert root.tag == "html"
+        body = root.children[0]
+        assert body.tag == "body"
+        # Empty body should have no text children
+        assert len(body.children) == 0

tests/test_http.py

@@ -0,0 +1,204 @@
+"""Tests for HTTP functionality."""
+
+import pytest
+from unittest.mock import Mock, patch, MagicMock
+from src.network.url import URL
+from src.network import http
+
+
+class TestHTTPRequest:
+    @patch('src.network.http.http.client.HTTPConnection')
+    def test_http_request_success(self, mock_conn_class):
+        # Setup mock
+        mock_conn = Mock()
+        mock_response = Mock()
+        mock_response.status = 200
+        mock_response.reason = "OK"
+        mock_response.getheader.return_value = "text/html"
+        mock_response.read.return_value = b"<html>Hello</html>"
+        
+        mock_conn.getresponse.return_value = mock_response
+        mock_conn_class.return_value = mock_conn
+        
+        # Test
+        url = URL("http://example.com/page")
+        status, content_type, body = http.request(url)
+        
+        assert status == 200
+        assert content_type == "text/html"
+        assert body == b"<html>Hello</html>"
+        
+    @patch('src.network.http.http.client.HTTPSConnection')
+    def test_https_request(self, mock_conn_class):
+        # Setup mock
+        mock_conn = Mock()
+        mock_response = Mock()
+        mock_response.status = 200
+        mock_response.reason = "OK"
+        mock_response.getheader.return_value = "text/html"
+        mock_response.read.return_value = b"Secure content"
+        
+        mock_conn.getresponse.return_value = mock_response
+        mock_conn_class.return_value = mock_conn
+        
+        # Test
+        url = URL("https://example.com")
+        status, content_type, body = http.request(url)
+        
+        assert status == 200
+        assert b"Secure" in body
+        mock_conn_class.assert_called_once()
+        
+    @patch('src.network.http.http.client.HTTPConnection')
+    def test_http_request_404(self, mock_conn_class):
+        # Setup mock
+        mock_conn = Mock()
+        mock_response = Mock()
+        mock_response.status = 404
+        mock_response.reason = "Not Found"
+        mock_response.getheader.return_value = "text/html"
+        mock_response.read.return_value = b"<html>Not Found</html>"
+        
+        mock_conn.getresponse.return_value = mock_response
+        mock_conn_class.return_value = mock_conn
+        
+        # Test
+        url = URL("http://example.com/missing")
+        status, content_type, body = http.request(url)
+        
+        assert status == 404
+        
+    @patch('src.network.http.http.client.HTTPConnection')
+    def test_http_request_with_user_agent(self, mock_conn_class):
+        # Setup mock
+        mock_conn = Mock()
+        mock_response = Mock()
+        mock_response.status = 200
+        mock_response.reason = "OK"
+        mock_response.getheader.return_value = "text/html"
+        mock_response.read.return_value = b"content"
+        
+        mock_conn.getresponse.return_value = mock_response
+        mock_conn_class.return_value = mock_conn
+        
+        # Test
+        url = URL("http://example.com")
+        http.request(url)
+        
+        # Verify User-Agent header was sent
+        call_args = mock_conn.request.call_args
+        headers = call_args[1]['headers']
+        assert 'User-Agent' in headers
+        assert 'Bowser' in headers['User-Agent']
+    
+    @patch('src.network.http.http.client.HTTPConnection')
+    def test_http_redirect_301(self, mock_conn_class):
+        """Test following 301 permanent redirect."""
+        # Setup mock for first request (redirect)
+        mock_conn = Mock()
+        mock_response_redirect = Mock()
+        mock_response_redirect.status = 301
+        mock_response_redirect.reason = "Moved Permanently"
+        mock_response_redirect.getheader.side_effect = lambda header, default="": {
+            "Content-Type": "text/html",
+            "Location": "http://example.com/new-page"
+        }.get(header, default)
+        mock_response_redirect.read.return_value = b"<html>Redirect</html>"
+        
+        # Setup mock for second request (final response)
+        mock_response_final = Mock()
+        mock_response_final.status = 200
+        mock_response_final.reason = "OK"
+        mock_response_final.getheader.side_effect = lambda header, default="": {
+            "Content-Type": "text/html",
+        }.get(header, default)
+        mock_response_final.read.return_value = b"<html>Final content</html>"
+        
+        mock_conn.getresponse.side_effect = [mock_response_redirect, mock_response_final]
+        mock_conn_class.return_value = mock_conn
+        
+        # Test
+        url = URL("http://example.com/old-page")
+        status, content_type, body = http.request(url)
+        
+        assert status == 200
+        assert body == b"<html>Final content</html>"
+        assert mock_conn.request.call_count == 2
+    
+    @patch('src.network.http.http.client.HTTPConnection')
+    def test_http_redirect_302(self, mock_conn_class):
+        """Test following 302 temporary redirect."""
+        # Setup mock for first request (redirect)
+        mock_conn = Mock()
+        mock_response_redirect = Mock()
+        mock_response_redirect.status = 302
+        mock_response_redirect.reason = "Found"
+        mock_response_redirect.getheader.side_effect = lambda header, default="": {
+            "Content-Type": "text/html",
+            "Location": "http://example.com/temp-page"
+        }.get(header, default)
+        mock_response_redirect.read.return_value = b"<html>Redirect</html>"
+        
+        # Setup mock for second request (final response)
+        mock_response_final = Mock()
+        mock_response_final.status = 200
+        mock_response_final.reason = "OK"
+        mock_response_final.getheader.side_effect = lambda header, default="": {
+            "Content-Type": "text/html",
+        }.get(header, default)
+        mock_response_final.read.return_value = b"<html>Temp content</html>"
+        
+        mock_conn.getresponse.side_effect = [mock_response_redirect, mock_response_final]
+        mock_conn_class.return_value = mock_conn
+        
+        # Test
+        url = URL("http://example.com/old-page")
+        status, content_type, body = http.request(url)
+        
+        assert status == 200
+        assert body == b"<html>Temp content</html>"
+    
+    @patch('src.network.http.http.client.HTTPConnection')
+    def test_http_redirect_no_location(self, mock_conn_class):
+        """Test handling of redirect without Location header."""
+        # Setup mock
+        mock_conn = Mock()
+        mock_response = Mock()
+        mock_response.status = 302
+        mock_response.reason = "Found"
+        mock_response.getheader.side_effect = lambda header, default="": {
+            "Content-Type": "text/html",
+        }.get(header, default)
+        mock_response.read.return_value = b"<html>Redirect</html>"
+        
+        mock_conn.getresponse.return_value = mock_response
+        mock_conn_class.return_value = mock_conn
+        
+        # Test
+        url = URL("http://example.com/page")
+        status, content_type, body = http.request(url)
+        
+        # Should return the redirect response if no Location header
+        assert status == 302
+        assert body == b"<html>Redirect</html>"
+    
+    @patch('src.network.http.http.client.HTTPConnection')
+    def test_http_max_redirects(self, mock_conn_class):
+        """Test that max redirects limit is enforced."""
+        # Setup mock that always returns a redirect
+        mock_conn = Mock()
+        mock_response = Mock()
+        mock_response.status = 302
+        mock_response.reason = "Found"
+        mock_response.getheader.side_effect = lambda header, default="": {
+            "Location": "http://example.com/redirect-loop"
+        }.get(header, default)
+        mock_response.read.return_value = b""
+        
+        mock_conn.getresponse.return_value = mock_response
+        mock_conn_class.return_value = mock_conn
+        
+        # Test with max_redirects=2
+        url = URL("http://example.com/page")
+        with pytest.raises(Exception, match="Too many redirects"):
+            http.request(url, max_redirects=2)