@gpt-4o
wieso kommt es zu problemen bei den api calls und bild generierungen?

fehler:
XHRPOST
https://api-inference.huggingface.co/models/stabilityai/sdxl-turbo
[HTTP/2 503  196ms]

Szene Generierung Fehler: Error: Maximale Anzahl an Versuchen für URL https://api-inference.huggingface.co/models/stabilityai/sdxl-turbo erreicht. Möglicherweise ist der Hugging Face API Dienst überlastet oder es gibt anhaltende Netzwerkprobleme. Bitte überprüfe deinen Token und versuche es später erneut.
data:PCFET0NUWVBFIGh0bWw+CjxodG1sIGxhbmc9ImRlIj4KPGhlYWQ+CiAgICA8bWV0YSBjaGFyc2V0PSJVVEYtOCI+CiAgICA:537:25

Code:

<!DOCTYPE html>
<html lang="de">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Graffiti Spray App</title>
    <style>
        body {
            font-family: 'Arial', sans-serif;
            margin: 0;
            padding: 0;
            background-color: #f4f4f4;
            color: #333;
            display: flex;
            flex-direction: column;
            align-items: center;
            min-height: 100vh;
        }

        .container {
            width: 95%;
            max-width: 1024px; /* Match canvas width */
            padding: 20px;
            background-color: #fff;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
            margin-top: 20px;
            margin-bottom: 20px;
            border-radius: 8px;
            display: flex;
            flex-direction: column;
            align-items: stretch;
        }

        h1 {
            text-align: center;
            color: #2c3e50;
            margin-bottom: 20px;
        }

        .token-section, .settings-section {
            margin-bottom: 15px;
            padding: 15px;
            border: 1px solid #ddd;
            border-radius: 5px;
            background-color: #f9f9f9;
        }

        .token-section label, .settings-section label {
            display: block;
            margin-bottom: 5px;
            font-weight: bold;
        }

        .token-section input[type="text"] {
            width: calc(100% - 22px);
            padding: 10px;
            margin-bottom: 5px;
            border: 1px solid #ccc;
            border-radius: 4px;
            font-size: 16px;
        }
        .token-section input[type="text"]:focus + span#token-status {
            display: none !important;
        }


        .token-section #token-status {
            display: none;
            margin-top: 5px;
            font-weight: bold;
            text-align: left;
            padding-left: 10px;
        }
        .token-section #token-status.success {
            color: green;
            display: block;
        }
        .token-section #token-status.error {
            color: red;
            display: block;
        }

        .token-section .example-token {
            font-size: 0.9em;
            color: #777;
            margin-top: 5px;
            cursor: pointer;
            text-decoration: underline;
            display: inline-block;
        }


        .settings-section input[type="checkbox"] {
            margin-right: 5px;
        }

        .canvas-container {
            border: 1px solid #ddd;
            border-radius: 5px;
            overflow: hidden;
            position: relative;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 768px; /* Match canvas height */
            width: 1024px; /* Match canvas width */
        }

        #graffiti-canvas {
            display: block;
            cursor: crosshair;
            position: absolute;
            top: 0;
            left: 0;
            z-index: 1;
            width: 1024px; /* Set canvas width */
            height: 768px; /* Set canvas height */
        }

        #error-message-area {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background-color: rgba(255, 255, 255, 0.8);
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
            text-align: center;
            font-weight: bold;
            color: red;
            z-index: 2;
            display: none;
        }
        #error-message-area.show {
            display: block;
        }


        #loading-indicator {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(255, 255, 255, 0.7);
            z-index: 1000;
            justify-content: center;
            align-items: center;
            font-size: 20px;
            font-weight: bold;
        }

        .loading-spinner {
            border: 16px solid #f3f3f3;
            border-top: 16px solid #3498db;
            border-radius: 50%;
            width: 120px;
            height: 120px;
            animation: spin 2s linear infinite;
            margin-bottom: 20px;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }


        /* Responsive adjustments */
        @media (max-width: 768px) {
            .container {
                width: 98%;
                margin-top: 10px;
                margin-bottom: 10px;
                padding: 15px;
            }
            h1 {
                font-size: 24px;
            }
            .token-section input[type="text"], .settings-section label, .token-section .example-token {
                font-size: 14px;
            }
            .canvas-container {
                height: 450px; /* Adjusted for smaller screens, consider making canvas responsive within container */
                width: 100%; /* Take full width on smaller screens */
            }
            #graffiti-canvas {
                width: 100%; /* Canvas takes full width */
                height: auto; /* Height adjusts to maintain aspect ratio */
                max-height: 450px; /* Limit max height */
            }

        }
    </style>
</head>
<body>
    <div class="container">
        <h1>Graffiti Spray App</h1>

        <div class="token-section">
            <label for="hf-token">Hugging Face Token:</label>
            <input type="text" id="hf-token" placeholder="Gib dein Hugging Face Token ein">
            <span id="token-status"></span>
            <div>
                <span class="example-token" id="prefill-token-text"><TRUFFLEHOG_REDACTED_HUGGINGFACE></span>
            </div>
        </div>

        <div class="settings-section">
            <label>
                <input type="checkbox" id="frequent-api"> Häufige API Anfragen (Experimentell, API Limit beachten!)
            </label>
        </div>

        <div class="canvas-container">
            <canvas id="graffiti-canvas" width="1024" height="768"></canvas>
            <div id="error-message-area"></div>
        </div>
    </div>

    <div id="loading-indicator">
        <div class="loading-spinner"></div>
        <span id="loading-message">Lade...</span>
    </div>

    <script>
        const canvas = document.getElementById('graffiti-canvas');
        const ctx = canvas.getContext('2d');
        const hfTokenInput = document.getElementById('hf-token');
        const tokenStatusSpan = document.getElementById('token-status');
        const frequentApiCheckbox = document.getElementById('frequent-api');
        const loadingIndicator = document.getElementById('loading-indicator');
        const loadingMessage = document.getElementById('loading-message');
        const prefillTokenText = document.getElementById('prefill-token-text');
        const errorMessageArea = document.getElementById('error-message-area');


        let drawing = false;
        let lastX = 0;
        let lastY = 0;
        let maskData = [];
        let currentStrokeMask = [];
        let baseImageURL = null;
        let isFrequentApiEnabled = false;
        let apiRequestInterval;
        let isApiRequestPending = false;

        const testHfToken = prefillTokenText.textContent;
        let currentModelEndpoint_Scene = 'https://api-inference.huggingface.co/models/stabilityai/sdxl-turbo'; // SDXL Turbo for faster scene gen
        let currentModelEndpoint_Inpaint = 'https://api-inference.huggingface.co/models/diffusers/stable-diffusion-xl-1.5-inpainting'; // Corrected endpoint - verify!


        // --- Utility Functions ---
        function showLoading(message = 'Lade...') {
            loadingMessage.textContent = message;
            loadingIndicator.style.display = 'flex';
            errorMessageArea.style.display = 'none';
        }

        function hideLoading() {
            loadingIndicator.style.display = 'none';
        }

        function displayError(message) {
            errorMessageArea.textContent = message;
            errorMessageArea.className = 'show';
        }


        // --- Token Handling ---
        hfTokenInput.addEventListener('input', debounce(validateToken, 500));
        prefillTokenText.addEventListener('click', prefillTestToken);
        frequentApiCheckbox.addEventListener('change', toggleFrequentApi);


        function prefillTestToken() {
            hfTokenInput.value = testHfToken;
            validateToken();
        }


        function debounce(func, delay) {
            let timeout;
            return function(...args) {
                const context = this;
                clearTimeout(timeout);
                timeout = setTimeout(() => func.apply(context, args), delay);
            };
        }


        async function validateToken() {
            const token = hfTokenInput.value.trim();
            if (!token) {
                tokenStatusSpan.textContent = 'Token fehlt.';
                tokenStatusSpan.className = 'error';
                displayError('Hugging Face Token fehlt. Bitte gib deinen Token ein.');
                return;
            }

            tokenStatusSpan.textContent = 'Token wird getestet...';
            tokenStatusSpan.className = '';
            showLoading('Token wird getestet...');
            errorMessageArea.style.display = 'none';


            try {
                const response = await fetch('https://huggingface.co/api/whoami-v2', {
                    headers: { Authorization: `Bearer ${token}` }
                });

                if (response.ok) {
                    const data = await response.json();
                    tokenStatusSpan.textContent = `Token gültig für Benutzer: ${data.name} - ERFOLG!`;
                    tokenStatusSpan.className = 'success';
                    errorMessageArea.style.display = 'none';
                    initializeApp();
                } else {
                    tokenStatusSpan.textContent = `Token ungültig. Fehlercode: ${response.status} - FEHLER!`;
                    tokenStatusSpan.className = 'error';
                    displayError(`Token ungültig. Fehlercode: ${response.status}. Bitte überprüfe deinen Hugging Face Token.`);
                }
            } catch (error) {
                console.error('Token Test Fehler:', error);
                tokenStatusSpan.textContent = 'Token Test fehlgeschlagen - FEHLER!';
                tokenStatusSpan.className = 'error';
                displayError('Token Validierung fehlgeschlagen. Netzwerkfehler oder ungültiger Token.');
            } finally {
                hideLoading();
            }
        }


        function toggleFrequentApi() {
            isFrequentApiEnabled = frequentApiCheckbox.checked;
            if (isFrequentApiEnabled) {
                startFrequentApiRequests();
            } else {
                stopFrequentApiRequests();
            }
        }

        function startFrequentApiRequests() {
            if (!apiRequestInterval) {
                apiRequestInterval = setInterval(sendInpaintingRequest, 500);
            }
        }

        function stopFrequentApiRequests() {
            clearInterval(apiRequestInterval);
            apiRequestInterval = null;
        }


        // --- Canvas Interaction and Drawing ---
        canvas.addEventListener('mousedown', startDrawing);
        canvas.addEventListener('mouseup', endDrawing);
        canvas.addEventListener('mouseout', endDrawing);
        canvas.addEventListener('mousemove', draw);

        function startDrawing(e) {
            if (!baseImageURL || isApiRequestPending || tokenStatusSpan.className !== 'success') return;
            drawing = true;
            lastX = e.offsetX;
            lastY = e.offsetY;
            currentStrokeMask = [];
            errorMessageArea.style.display = 'none';
        }

        function draw(e) {
            if (!drawing) return;

            const x = e.offsetX;
            const y = e.offsetY;

            ctx.beginPath();
            ctx.strokeStyle = 'rgba(255, 0, 0, 0.8)';
            ctx.lineWidth = 5;
            ctx.lineJoin = 'round';
            ctx.lineCap = 'round';
            ctx.moveTo(lastX, lastY);
            ctx.lineTo(x, y);
            ctx.closePath();
            ctx.stroke();

            drawLineMask(lastX, lastY, x, y, 5);
            lastX = x;
            lastY = y;

            if (isFrequentApiEnabled) {

            }
        }


        function endDrawing() {
            if (!drawing) return;
            drawing = false;
            if (!isFrequentApiEnabled) {
                sendInpaintingRequest();
            }
        }


        function drawLineMask(x0, y0, x1, y1, lineWidth) {
            const points = getLinePoints(x0, y0, x1, y1);
            points.forEach(point => {
                drawCircleMask(point.x, point.y, lineWidth / 2);
            });
        }

        function getLinePoints(x0, y0, x1, y1) {
            let points = [];
            const dx = Math.abs(x1 - x0);
            const dy = Math.abs(y1 - y0);
            const sx = (x0 < x1) ? 1 : -1;
            const sy = (y0 < y1) ? 1 : -1;
            let err = dx - dy;

            while(true){
                points.push({x: x0, y: y0});
                if ((x0===x1) && (y0===y1)) break;
                let e2 = 2*err;
                if (e2 > -dy){ err -= dy; x0  += sx; }
                if (e2 < dx){ err += dx; y0  += sy; }
            }
            return points;
        }


        function drawCircleMask(x, y, radius) {
            for (let i = -radius; i <= radius; i++) {
                for (let j = -radius; j <= radius; j++) {
                    if (i * i + j * j <= radius * radius) {
                        const maskX = Math.round(x + i);
                        const maskY = Math.round(y + j);
                        if (maskX >= 0 && maskX < canvas.width && maskY >= 0 && maskY < canvas.height) {
                            currentStrokeMask.push({x: maskX, y: maskY});
                        }
                    }
                }
            }
        }


        function mergeMasks(mask1, mask2) {
            const mergedMask = [...mask1];
            mask2.forEach(point => {
                if (!mergedMask.some(p => p.x === point.x && p.y === point.y)) {
                    mergedMask.push(point);
                }
            });
            return mergedMask;
        }


        function maskToImageData(mask) {
            const imageData = ctx.createImageData(canvas.width, canvas.height);
            mask.forEach(point => {
                const index = (point.y * canvas.width + point.x) * 4;
                imageData.data[index] = 255;
                imageData.data[index+1] = 255;
                imageData.data[index+2] = 255;
                imageData.data[index+3] = 255;
            });
            return imageData;
        }


        function clearCanvas() {
            ctx.clearRect(0, 0, canvas.width, canvas.height);
        }


        // --- API Interaction Functions ---
        async function initializeApp() {
            if (!baseImageURL && tokenStatusSpan.className === 'success') {
                await generateInitialScene();
            } else if (tokenStatusSpan.className !== 'success') {
                displayError('Bitte gib einen gültigen Hugging Face Token ein, um zu beginnen.');
            }
        }


        async function generateInitialScene() {
            tokenStatusSpan.textContent = 'Generiere Umgebung...';
            tokenStatusSpan.className = '';
            clearCanvas();
            baseImageURL = null;
            showLoading('Generiere Umgebung...');
            isApiRequestPending = true;
            errorMessageArea.style.display = 'none';

            const token = hfTokenInput.value.trim();
            const scenePrompt = getRandomScenePrompt();

            // Generate Mask for Inpainting Area (centered rectangle)
            const maskCanvas = document.createElement('canvas');
            maskCanvas.width = canvas.width;
            maskCanvas.height = canvas.height;
            const maskCtx = maskCanvas.getContext('2d');
            maskCtx.fillStyle = 'white'; // White for inpaint mask
            const maskYStart = canvas.height / 6; // 1/6 from top
            const maskHeight = canvas.height - (2 * maskYStart); // Middle 2/3 height
            maskCtx.fillRect(0, maskYStart, canvas.width, maskHeight); // Centered Mask
            const initialSceneMaskBlob = await new Promise(resolve => maskCanvas.toBlob(resolve, 'image/png'));


            try {
                const response = await fetchWithRetry(currentModelEndpoint_Scene, {
                    method: 'POST',
                    headers: {
                        'Authorization': `Bearer ${token}`,
                        'Content-Type': 'application/json'
                    },
                    body: JSON.stringify({ inputs: scenePrompt, parameters: {negative_prompt: "ugly, bad anatomy, blurry, pixelated, low quality, realistic, dark, too much contrast, oversaturated colors"} }), // Adjusted negative prompt
                });

                if (!response.ok) {
                    throw new Error(`Szene Generierung fehlgeschlagen! Status: ${response.status}`);
                }

                const blob = await response.blob();
                baseImageURL = URL.createObjectURL(blob);
                const image = new Image();
                image.onload = () => {
                    ctx.drawImage(image, 0, 0, canvas.width, canvas.height);
                    tokenStatusSpan.textContent = 'Umgebung generiert. Starte mit dem Sprayen!';
                    tokenStatusSpan.className = 'success';
                    inpaintWritableArea(initialSceneMaskBlob); // Pass mask blob to inpaint function
                };
                image.src = baseImageURL;

            } catch (error) {
                console.error('Szene Generierung Fehler:', error);
                tokenStatusSpan.textContent = `Szene Generierung fehlgeschlagen - FEHLER! ${error.message}`;
                tokenStatusSpan.className = 'error';
                displayError(`Szene konnte nicht generiert werden. ${error.message}. Bitte überprüfe deine Netzwerkverbindung und versuche es später erneut. Wenn das Problem weiterhin besteht, ist möglicherweise der Hugging Face API-Dienst überlastet oder es gibt ein Problem mit deinem Token.`);
            } finally {
                hideLoading();
                isApiRequestPending = false;
            }
        }


        async function inpaintWritableArea(initialSceneMaskBlob) {
            tokenStatusSpan.textContent = 'Bearbeite bemalbaren Bereich...';
            tokenStatusSpan.className = '';
            showLoading('Bearbeite bemalbaren Bereich...');
            isApiRequestPending = true;
            errorMessageArea.style.display = 'none';

            const token = hfTokenInput.value.trim();


            if (!baseImageURL || !initialSceneMaskBlob) {
                tokenStatusSpan.textContent = 'Basisbild oder Maske fehlt für Inpainting - FEHLER!';
                tokenStatusSpan.className = 'error';
                displayError('Basisbild oder Maske fehlt für Inpainting. Bitte zuerst Umgebung generieren.');
                hideLoading();
                isApiRequestPending = false;
                return;
            }


            const imageBlob = await fetch(baseImageURL).then(res => res.blob());

            const formData = new FormData();
            formData.append('image', imageBlob, 'scene.png');
            formData.append('mask_image', initialSceneMaskBlob, 'mask.png'); // Use pre-generated mask blob
            formData.append('prompt', getInpaintAreaPrompt());

            try {
                const response = await fetchWithRetry(currentModelEndpoint_Inpaint, {
                    method: 'POST',
                    headers: {
                        'Authorization': `Bearer ${token}`,
                    },
                    body: formData,
                });


                if (!response.ok) {
                    throw new Error(`Inpainting bemalbarer Bereich fehlgeschlagen! Status: ${response.status}`);
                }

                const blob = await response.blob();
                baseImageURL = URL.createObjectURL(blob);
                const image = new Image();
                image.onload = () => {
                    clearCanvas();
                    ctx.drawImage(image, 0, 0, canvas.width, canvas.height);
                    tokenStatusSpan.textContent = 'Bemalbarer Bereich vorbereitet. Viel Spaß beim Sprayen!';
                    tokenStatusSpan.className = 'success';
                };
                image.src = baseImageURL;


            } catch (error) {
                console.error('Inpainting Fehler (Bereich):', error);
                tokenStatusSpan.textContent = `Inpainting bemalbaren Bereich fehlgeschlagen - FEHLER! ${error.message}`;
                tokenStatusSpan.className = 'error';
                displayError(`Der bemalbare Bereich konnte nicht vorbereitet werden. ${error.message}.  Bitte überprüfe deine Netzwerkverbindung und versuche es später erneut. Wenn das Problem weiterhin besteht, ist möglicherweise der Hugging Face API-Dienst überlastet oder es gibt ein Problem mit deinem Token.`);
            } finally {
                hideLoading();
                isApiRequestPending = false;
            }
        }


        async function sendInpaintingRequest() {
            if (!baseImageURL || currentStrokeMask.length === 0 || isApiRequestPending) return;

            tokenStatusSpan.textContent = 'Generiere Graffiti...';
            tokenStatusSpan.className = '';
            showLoading('Generiere Graffiti...');
            isApiRequestPending = true;
            errorMessageArea.style.display = 'none';

            const token = hfTokenInput.value.trim();


            const maskImageData = maskToImageData(currentStrokeMask);
            const maskCanvas = document.createElement('canvas');
            maskCanvas.width = canvas.width;
            maskCanvas.height = canvas.height;
            const maskCtx = maskCanvas.getContext('2d');
            maskCtx.putImageData(maskImageData, 0, 0);
            const maskBlob = await new Promise(resolve => maskCanvas.toBlob(resolve, 'image/png'));

            const imageBlob = await fetch(baseImageURL).then(res => res.blob());


            const formData = new FormData();
            formData.append('image', imageBlob, 'base_image.png');
            formData.append('mask_image', maskBlob, 'mask_image.png');
            formData.append('prompt', getGraffitiPrompt());

            try {
                const response = await fetchWithRetry(currentModelEndpoint_Inpaint, {
                    method: 'POST',
                    headers: {
                        'Authorization': `Bearer ${token}`,
                    },
                    body: formData,
                });


                if (!response.ok) {
                    throw new Error(`Graffiti Generierung fehlgeschlagen! Status: ${response.status}`);
                }

                const blob = await response.blob();
                const tempGraffitiURL = URL.createObjectURL(blob);
                const image = new Image();
                image.onload = () => {
                    clearCanvas();
                    ctx.drawImage(image, 0, 0, canvas.width, canvas.height);
                    baseImageURL = tempGraffitiURL;
                    maskData = mergeMasks(maskData, currentStrokeMask);
                    currentStrokeMask = [];
                    tokenStatusSpan.textContent = 'Graffiti generiert!';
                    tokenStatusSpan.className = 'success';
                };
                image.src = tempGraffitiURL;


            } catch (error) {
                console.error('Graffiti Generierung Fehler:', error);
                tokenStatusSpan.textContent = `Graffiti Generierung fehlgeschlagen - FEHLER! ${error.message}`;
                tokenStatusSpan.className = 'error';
                displayError(`Graffiti konnte nicht generiert werden. ${error.message}. Bitte überprüfe deine Netzwerkverbindung und versuche es später erneut. Wenn das Problem weiterhin besteht, ist möglicherweise der Hugging Face API-Dienst überlastet oder es gibt ein Problem mit deinem Token oder API Limits.`);
            } finally {
                hideLoading();
                isApiRequestPending = false;
            }
        }


        // --- Retry Logic for Fetch API ---
        async function fetchWithRetry(url, options, maxRetries = 3, delay = 1000, backoffFactor = 2) {
            let retries = 0;
            while (retries < maxRetries) {
                try {
                    const response = await fetch(url, options);
                    if (response.status === 503) {
                        retries++;
                        const waitTime = delay * Math.pow(backoffFactor, retries -1);
                        console.log(`Server busy (503). Retry ${retries} in ${waitTime/1000} seconds...`);
                        loadingMessage.textContent = `Server beschäftigt - möglicherweise wegen API Limits oder hoher Last. Warte ${waitTime/1000} Sekunden bis zum nächsten Versuch...`;
                        await new Promise(resolve => setTimeout(resolve, waitTime));
                    } else if (!response.ok) {
                        throw new Error(`HTTP error! status: ${response.status}`);
                    } else {
                        return response;
                    }
                } catch (error) {
                    console.error("Fetch error:", error);
                    retries++;
                    if (retries < maxRetries) {
                        const waitTime = delay * Math.pow(backoffFactor, retries - 1);
                        console.log(`Retry ${retries} in ${waitTime/1000} seconds...`);
                        loadingMessage.textContent = `Netzwerkfehler. Warte ${waitTime/1000} Sekunden bis zum nächsten Versuch...`;
                        await new Promise(resolve => setTimeout(resolve, waitTime));
                    } else {
                        throw new Error(`Maximale Anzahl an Versuchen erreicht. Letzter Fehler: ${error}`);
                    }
                }
            }
            throw new Error(`Maximale Anzahl an Versuchen für URL ${url} erreicht. Möglicherweise ist der Hugging Face API Dienst überlastet oder es gibt anhaltende Netzwerkprobleme. Bitte überprüfe deinen Token und versuche es später erneut.`);
        }


        // --- Prompt Functions ---
        function getRandomScenePrompt() {
            const scenes = [
                "a brick wall in a dark alley at night",
                "a concrete wall on a rooftop in a city at sunset",
                "a metal shutter of a shop during daytime",
                "a weathered wooden fence in an abandoned yard",
                "a highway sound barrier during a cloudy day"
            ];
            return scenes[Math.floor(Math.random() * scenes.length)];
        }

        function getInpaintAreaPrompt() {
            return "clean brick wall, ready for graffiti, no paint, photorealistic, front view"; // More specific prompt for brick wall structure
        }


        function getGraffitiPrompt() {
            return "graffiti art, vibrant colors, dripping paint, tags, street art style, photorealistic";
        }


        // --- Initialize on load ---
        // No initialization on load, starts after token validation

    </script>
</body>
</html>