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<h1 class="menu-title">Juniper - GraphQL Server for Rust</h1>
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<a class="header" href="#multiple-operations-per-request" id="multiple-operations-per-request"><h1>Multiple operations per request</h1></a>
<p>The GraphQL standard generally assumes there will be one server request for each client operation you want to perform (such as a query or mutation). This is conceptually simple but has the potential to be inefficent.</p>
<p>Some client libraries such as <a href="https://www.apollographql.com/docs/link/links/batch-http.html">apollo-link-batch-http</a> have added the ability to batch operations in a single HTTP request to save network round-trips and potentially increase performance. There are some <a href="https://blog.apollographql.com/batching-client-graphql-queries-a685f5bcd41b">tradeoffs</a> that should be considered before batching requests.</p>
<p>Juniper's server integration crates support multiple operations in a single HTTP request using JSON arrays. This makes them compatible with client libraries that support batch operations without any special configuration.</p>
<p>Server integration crates maintained by others are <strong>not required</strong> to support batch requests. Batch requests aren't part of the official GraphQL specification.</p>
<p>Assuming an integration supports batch requests, for the following GraphQL query:</p>
<pre><code class="language-graphql">{
hero {
name
}
}
</code></pre>
<p>The json data to POST to the server for an individual request would be:</p>
<pre><code class="language-json">{
"query": "{hero{name}}"
}
</code></pre>
<p>And the response would be of the form:</p>
<pre><code class="language-json">{
"data": {
"hero": {
"name": "R2-D2"
}
}
}
</code></pre>
<p>If you wanted to run the same query twice in a single HTTP request, the batched json data to POST to the server would be:</p>
<pre><code class="language-json">[
{
"query": "{hero{name}}"
},
{
"query": "{hero{name}}"
}
]
</code></pre>
<p>And the response would be of the form:</p>
<pre><code class="language-json">[
{
"data": {
"hero": {
"name": "R2-D2"
}
}
},
{
"data": {
"hero": {
"name": "R2-D2"
}
}
}
]
</code></pre>
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