title: No http lib found to perform ajax request in VJSF
body: <p>I use VJSF to fill selects using the results from HTTP requests.
  Then I faced a bug that is stressful.
  <a href="https://i.stack.imgur.com/NTJcf.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/NTJcf.png" alt="enter image description here" /></a>
  Following is my code.</p>
  <pre><code>&lt;template&gt;
    &lt;v-app id=&quot;app&quot;&gt;
      &lt;v-container&gt;
        &lt;p&gt;valid={{valid}}&lt;/p&gt;
        &lt;v-form ref=&quot;form&quot; v-model=&quot;valid&quot;&gt;
          &lt;v-jsf v-model=&quot;model&quot; :schema=&quot;schema&quot; :options=&quot;options&quot; @input=&quot;logEvent('input', $event)&quot; @change=&quot;logEvent('change', $event)&quot; /&gt;
        &lt;/v-form&gt;
        &lt;v-layout row class=&quot;mt-2&quot;&gt;
          &lt;v-spacer&gt;&lt;/v-spacer&gt;
          &lt;v-btn color=&quot;primary&quot; @click=&quot;$refs.form.validate()&quot;&gt;Validate&lt;/v-btn&gt;
        &lt;/v-layout&gt;
      &lt;/v-container&gt;
    &lt;/v-app&gt;
  &lt;/template&gt;
  
  &lt;script&gt;
  
  import VJsf from '@koumoul/vjsf/lib/VJsf.js'
  import '@koumoul/vjsf/lib/VJsf.css'
  import '@koumoul/vjsf/lib/deps/third-party.js'
  
  const model = {
      selectAjaxString: 'https://koumoul.com/s/data-fair/api/v1/datasets/gendarmeries-france-metropolitaine'
  }
  
  const options =  {
      context: {
          owner: {
              type: 'organization',
              id: '5a5dc47163ebd4a6f438589b'
          }
      },
      idPrefix: 'example-select-http-'
  }
  
  const schema = {
      type: 'object',
      properties: {
          selectAjaxString: {
              type: 'string',
              title: 'I\'m a string selected from results of an HTTP request',
              'x-fromUrl': 'https://koumoul.com/s/data-fair/api/v1/datasets?status=finalized&amp;select=title&amp;owner={context.owner.type}:{context.owner.id}',
              'x-itemsProp': 'results',
              'x-itemTitle': 'title',
              'x-itemKey': 'href'
          }
      }
  }
  
  export default {
    name: 'App',
    components: { VJsf },
    data: () =&gt; ({
      model,
      options,
      schema,
      valid: false
    }),
    methods: {
      logEvent(key, $event) {
        console.log(&quot;vjsf event&quot;, key, $event);
      }
    }
  };
  &lt;/script&gt;
  </code></pre>
  <p>What is the reason?
  Why I can not perform ajax request?
  I followed sample in <a href="https://koumoul-dev.github.io/vuetify-jsonschema-form/latest/examples#select-http" rel="nofollow noreferrer">https://koumoul-dev.github.io/vuetify-jsonschema-form/latest/examples#select-http</a></p>