vh
984ca3d383
Zero-dependency, zero-backend HTML chat UI for the LiteLLM gateway. The browser talks straight to :4000 (gateway CORS is open), so it's just one file you open — no container, no stack. System-prompt textarea, model datalist, streaming SSE, renders reasoning_content for the -thinking/ -reasoning models, settings persist in localStorage. Deliberately never sends a `tools` field, sidestepping the vLLM "tools must not be an empty array" bug that breaks the LiteLLM admin UI playground for vLLM-backed models (litellm #6228; the gateway's strip_empty_tools hook can't reach the UI's in-process completion call). Verified against the live gateway: streams + parses a real completion with no tools sent.
157 lines
7.6 KiB
HTML
157 lines
7.6 KiB
HTML
<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>Gateway Chat — light LiteLLM playground</title>
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<!--
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Single-file chat playground for the LiteLLM gateway (10.250.50.70:4000).
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Zero dependencies, zero backend: open it in a browser (file:// is fine) or
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serve statically. The gateway sends permissive CORS, so the browser talks to
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it directly. It deliberately NEVER sends a `tools` field, sidestepping the
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vLLM "tools must not be an empty array" bug that breaks the LiteLLM UI
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playground for vLLM-backed models. Settings persist in localStorage.
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-->
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<style>
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:root{--bg:#0f1115;--panel:#171a21;--ink:#e6e9ef;--muted:#8b93a7;--acc:#5b8cff;--line:#262b36;--user:#1f6feb22;--warn:#ff6b6b}
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*{box-sizing:border-box}
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body{margin:0;font:14px/1.55 system-ui,sans-serif;background:var(--bg);color:var(--ink);display:flex;height:100vh}
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#side{width:330px;min-width:330px;background:var(--panel);border-right:1px solid var(--line);padding:14px;overflow:auto}
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#main{flex:1;display:flex;flex-direction:column;min-width:0}
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h1{font-size:13px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:0 0 12px}
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label{display:block;font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin:10px 0 4px}
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input,textarea,select{width:100%;background:#0c0e13;color:var(--ink);border:1px solid var(--line);border-radius:6px;padding:7px 8px;font:inherit}
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textarea{resize:vertical}
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#sys{min-height:130px;font-family:ui-monospace,monospace;font-size:12px}
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.row{display:flex;gap:8px}.row>*{flex:1}
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#log{flex:1;overflow:auto;padding:18px;display:flex;flex-direction:column;gap:14px}
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.msg{max-width:840px}
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.msg .who{font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin-bottom:3px}
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.msg .body{white-space:pre-wrap;word-wrap:break-word}
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.msg.user .body{background:var(--user);border:1px solid #1f6feb55;border-radius:8px;padding:8px 10px}
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.msg .reason{white-space:pre-wrap;color:var(--muted);font-size:12.5px;border-left:2px solid var(--line);padding-left:10px;margin-bottom:6px}
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#composer{border-top:1px solid var(--line);padding:12px 18px;display:flex;gap:10px;background:var(--panel)}
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#inp{flex:1;min-height:42px;max-height:220px}
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button{background:var(--acc);color:#fff;border:0;border-radius:6px;padding:0 16px;font:inherit;font-weight:600;cursor:pointer}
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button.ghost{background:transparent;color:var(--muted);border:1px solid var(--line)}
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button:disabled{opacity:.5;cursor:default}
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.err{color:var(--warn);font-family:ui-monospace,monospace;font-size:12px;white-space:pre-wrap}
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.hint{font-size:11px;color:var(--muted);margin-top:8px}
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code{font-family:ui-monospace,monospace}
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</style>
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</head>
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<body>
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<aside id="side">
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<h1>Gateway Chat</h1>
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<label>Base URL</label>
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<input id="base" placeholder="http://10.250.50.70:4000/v1">
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<label>API key</label>
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<input id="key" type="password" placeholder="sk-…">
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<label>Model</label>
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<input id="model" list="models" placeholder="mistral-small-4">
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<datalist id="models">
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<option>granite-4.1-8b</option>
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<option>mistral-small-4</option>
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<option>mistral-small-4-reasoning</option>
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<option>qwen3.6-35b-a3b</option>
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<option>qwen3.6-35b-a3b-thinking</option>
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<option>selene-1-mini-8b</option>
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<option>glm-5.1</option>
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<option>glm-4.7</option>
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</datalist>
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<label>System prompt</label>
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<textarea id="sys" placeholder="You are a helpful assistant."></textarea>
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<div class="row">
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<div><label>Temperature</label><input id="temp" type="number" step="0.05" value="1"></div>
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<div><label>Max tokens</label><input id="max" type="number" step="1" value="1024"></div>
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</div>
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<div class="hint">Settings persist locally. No <code>tools</code> field is ever sent. Reasoning models show their <code>reasoning_content</code> above the answer.</div>
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</aside>
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<main id="main">
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<div id="log"></div>
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<div id="composer">
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<textarea id="inp" placeholder="Message… (Enter to send · Shift+Enter for newline)"></textarea>
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<button id="send">Send</button>
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<button id="reset" class="ghost" title="Clear conversation">Reset</button>
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</div>
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</main>
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<script>
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const $ = id => document.getElementById(id);
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const cfg = ['base','key','model','sys','temp','max'];
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cfg.forEach(k => { const v = localStorage.getItem('gc_'+k); if (v !== null) $(k).value = v; });
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if (!$('base').value) $('base').value = 'http://10.250.50.70:4000/v1';
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cfg.forEach(k => $(k).addEventListener('input', e => localStorage.setItem('gc_'+k, e.target.value)));
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let history = []; // [{role:'user'|'assistant', content}]
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const log = $('log');
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function addMsg(who, cls){
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const wrap = document.createElement('div'); wrap.className = 'msg ' + cls;
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const h = document.createElement('div'); h.className = 'who'; h.textContent = who;
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const r = document.createElement('div'); r.className = 'reason'; r.style.display = 'none';
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const b = document.createElement('div'); b.className = 'body';
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wrap.append(h, r, b); log.append(wrap); log.scrollTop = log.scrollHeight;
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return { wrap, reason:r, body:b };
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}
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function showErr(text){ const m = addMsg('error','err'); m.body.className = 'err'; m.body.textContent = text; }
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async function send(){
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const text = $('inp').value.trim(); if (!text) return;
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$('inp').value = '';
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history.push({ role:'user', content:text });
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addMsg('you','user').body.textContent = text;
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const messages = [];
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const sys = $('sys').value.trim();
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if (sys) messages.push({ role:'system', content:sys });
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messages.push(...history);
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const body = {
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model: $('model').value.trim() || 'mistral-small-4',
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messages,
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temperature: parseFloat($('temp').value),
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max_tokens: parseInt($('max').value, 10),
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stream: true
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// intentionally NO `tools` — vLLM 400s on an empty array.
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};
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const out = addMsg(body.model, 'assistant');
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let content = '', reasoning = '';
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$('send').disabled = true;
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try {
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const res = await fetch($('base').value.replace(/\/+$/,'') + '/chat/completions', {
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method:'POST',
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headers:{ 'Content-Type':'application/json', 'Authorization':'Bearer ' + $('key').value },
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body: JSON.stringify(body)
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});
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if (!res.ok){ showErr('HTTP ' + res.status + '\n' + await res.text()); out.wrap.remove(); return; }
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const reader = res.body.getReader(); const dec = new TextDecoder(); let buf = '';
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for(;;){
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const { done, value } = await reader.read(); if (done) break;
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buf += dec.decode(value, { stream:true });
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const lines = buf.split('\n'); buf = lines.pop();
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for (const line of lines){
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const t = line.trim(); if (!t.startsWith('data:')) continue;
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const payload = t.slice(5).trim(); if (payload === '[DONE]') continue;
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let j; try { j = JSON.parse(payload); } catch { continue; }
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const d = (j.choices && j.choices[0] && j.choices[0].delta) || {};
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if (d.reasoning_content){ reasoning += d.reasoning_content; out.reason.style.display = 'block'; out.reason.textContent = reasoning; }
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if (d.content){ content += d.content; out.body.textContent = content; }
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log.scrollTop = log.scrollHeight;
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}
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}
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history.push({ role:'assistant', content });
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} catch (e){
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showErr(String(e)); out.wrap.remove();
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} finally {
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$('send').disabled = false;
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}
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}
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$('send').addEventListener('click', send);
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$('inp').addEventListener('keydown', e => { if (e.key === 'Enter' && !e.shiftKey){ e.preventDefault(); send(); } });
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$('reset').addEventListener('click', () => { history = []; log.innerHTML = ''; });
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</script>
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</body>
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</html>
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