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</pre><div class="example-wrap"><pre class="rust ">
<span class="kw">use</span> <span class="ident">actix_web</span>::{<span class="ident">http</span>::<span class="ident">StatusCode</span>, <span class="ident">HttpResponse</span>, <span class="ident">ResponseError</span>};
<span class="kw">use</span> <span class="ident">derive_more</span>::{<span class="ident">Display</span>, <span class="ident">Error</span>};
<span class="doccomment">/// Errors that can occur when processing CORS guarded requests.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">Clone</span>, <span class="ident">Display</span>, <span class="ident">Error</span>)]</span>
<span class="attribute">#[<span class="ident">non_exhaustive</span>]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">CorsError</span> {
<span class="doccomment">/// Allowed origin argument must not be wildcard (`*`).</span>
<span class="attribute">#[<span class="ident">display</span>(<span class="ident">fmt</span> <span class="op">=</span> <span class="string">"`allowed_origin` argument must not be wildcard (`*`)."</span>)]</span>
<span class="ident">WildcardOrigin</span>,
<span class="doccomment">/// Request header `Origin` is required but was not provided.</span>
<span class="attribute">#[<span class="ident">display</span>(<span class="ident">fmt</span> <span class="op">=</span> <span class="string">"Request header `Origin` is required but was not provided."</span>)]</span>
<span class="ident">MissingOrigin</span>,
<span class="doccomment">/// Request header `Access-Control-Request-Method` is required but is missing.</span>
<span class="attribute">#[<span class="ident">display</span>(
<span class="ident">fmt</span> <span class="op">=</span> <span class="string">"Request header `Access-Control-Request-Method` is required but is missing."</span>
)]</span>
<span class="ident">MissingRequestMethod</span>,
<span class="doccomment">/// Request header `Access-Control-Request-Method` has an invalid value.</span>
<span class="attribute">#[<span class="ident">display</span>(
<span class="ident">fmt</span> <span class="op">=</span> <span class="string">"Request header `Access-Control-Request-Method` has an invalid value."</span>
)]</span>
<span class="ident">BadRequestMethod</span>,
<span class="doccomment">/// Request header `Access-Control-Request-Headers` has an invalid value.</span>
<span class="attribute">#[<span class="ident">display</span>(
<span class="ident">fmt</span> <span class="op">=</span> <span class="string">"Request header `Access-Control-Request-Headers` has an invalid value."</span>
)]</span>
<span class="ident">BadRequestHeaders</span>,
<span class="doccomment">/// Origin is not allowed to make this request.</span>
<span class="attribute">#[<span class="ident">display</span>(<span class="ident">fmt</span> <span class="op">=</span> <span class="string">"Origin is not allowed to make this request."</span>)]</span>
<span class="ident">OriginNotAllowed</span>,
<span class="doccomment">/// Request method is not allowed.</span>
<span class="attribute">#[<span class="ident">display</span>(<span class="ident">fmt</span> <span class="op">=</span> <span class="string">"Requested method is not allowed."</span>)]</span>
<span class="ident">MethodNotAllowed</span>,
<span class="doccomment">/// One or more request headers are not allowed.</span>
<span class="attribute">#[<span class="ident">display</span>(<span class="ident">fmt</span> <span class="op">=</span> <span class="string">"One or more request headers are not allowed."</span>)]</span>
<span class="ident">HeadersNotAllowed</span>,
}
<span class="kw">impl</span> <span class="ident">ResponseError</span> <span class="kw">for</span> <span class="ident">CorsError</span> {
<span class="kw">fn</span> <span class="ident">status_code</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">StatusCode</span> {
<span class="ident">StatusCode</span>::<span class="ident">BAD_REQUEST</span>
}
<span class="kw">fn</span> <span class="ident">error_response</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">HttpResponse</span> {
<span class="ident">HttpResponse</span>::<span class="ident">with_body</span>(<span class="ident">StatusCode</span>::<span class="ident">BAD_REQUEST</span>, <span class="self">self</span>.<span class="ident">to_string</span>().<span class="ident">into</span>())
}
}
</pre></div>
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