Streaming

The Infron API allows streaming responses from any model. This is useful for building chat interfaces or other applications where the UI should update as the model generates the response.

To enable streaming, you can set the stream parameter to true in your request. The model will then stream the response to the client in chunks, rather than returning the entire response at once.

Examples

Here is an example of how to stream a response, and process it:

import requests
import json

question = "How would you build the tallest building ever?"

url = "https://llm.onerouter.pro/v1/chat/completions"
headers = {
  "Authorization": f"Bearer {{API_KEY}}",
  "Content-Type": "application/json"
}

payload = {
  "model": "google/gemini-2.5-flash",
  "messages": [{"role": "user", "content": question}],
  "stream": True
}

buffer = ""
with requests.post(url, headers=headers, json=payload, stream=True) as r:
  for chunk in r.iter_content(chunk_size=1024, decode_unicode=True):
    buffer += chunk
    while True:
      try:
        # Find the next complete SSE line
        line_end = buffer.find('\n')
        if line_end == -1:
          break

        line = buffer[:line_end].strip()
        buffer = buffer[line_end + 1:]

        if line.startswith('data: '):
          data = line[6:]
          if data == '[DONE]':
            break

          try:
            data_obj = json.loads(data)
            content = data_obj["choices"][0]["delta"].get("content")
            if content:
              print(content, end="", flush=True)
          except json.JSONDecodeError:
            pass
      except Exception:
        break


curl -sN \
  -H "Authorization: Bearer YOUR-API-KEY" \
  -H "Content-Type: application/json" \
  -X POST "https://llm.onerouter.pro/v1/chat/completions" \
  -d '{
    "model": "google/gemini-2.5-flash",
    "messages": [{"role": "user", "content": "How would you build the tallest building ever?"}],
    "stream": true
  }' | while IFS= read -r line; do
      if [[ "$line" == data:* ]]; then
          data="${line#data: }"

          if [[ "$data" == "[DONE]" ]]; then
              break
          fi

          content=$(echo "$data" | jq -r '.choices[0].delta.content // empty' 2>/dev/null)
          if [[ -n "$content" ]]; then
              printf "%s" "$content"
          fi
      fi
  done

Additional Information

For SSE (Server-Sent Events) streams, Infron occasionally sends comments to prevent connection timeouts. These comments look like:

INFRONAI PROCESSING

Comment payload can be safely ignored per the SSE specs. However, you can leverage it to improve UX as needed, e.g. by showing a dynamic loading indicator.

Some SSE client implementations might not parse the payload according to spec, which leads to an uncaught error when you JSON.stringify the non-JSON payloads. We recommend the following clients:

NextAuthentication

Last updated 3 months ago