Internal server error with certain API keys when model identifier contains space characters

[dandv]

Using the problematic key from #690, the code therein returns not_found_error if the model is invalid-model. But if the invalid model name contains a space, the code returns error: { type: 'api_error', message: 'Internal server error' }:

const response = await fetch('https://api.anthropic.com/v1/messages', {
  method: 'POST',
  headers: {
    'x-api-key': 'sk-ant-api03-1WH_3...-ONyGHQAA',
    'anthropic-version': '2023-06-01',  // required by the Messages API
  },
  body: JSON.stringify({
    messages: [{ role: 'user', content: 'Hello' }],
    max_tokens: 4096,  // required, maximum
    model: 'invalid model',  // instead of `invalid-model`
  }),
});
console.log(await response.json());