Mule file download with HTTP Endpoint

Question

My HTTP Endpoint responsible for downloading the file at the end of the flow is erroring out. It keeps trying to communicate with http://:80/ instead of the URL

Answer 1

I can't spot the error: your flow looks good (except a problem I'll detail below) so, alternatively to using an http:outbound-endpoint, which can be finicky at times, you could use the http:rest-service-component.

Your next problem will be in the outputPattern of the file endpoint: remember at this point message.payload will be the response from the HTTP endpoint not the (partial) URL anymore. You need to pre-compute the file name and store it in a flow variable, then use it.

This would give:

<configuration>
  <expression-language>
    <import class="org.mule.util.StringUtils" />
  </expression-language>
</configuration>

<flow name="BingFlow1" doc:name="BingFlow1">
    <http:inbound-endpoint exchange-pattern="one-way" host="localhost" port="8081" doc:name="HTTP"/>
    <https:outbound-endpoint exchange-pattern="request-response" host="api.datamarket.azure.com" port="443" path="Data.ashx/Bing/Search/v1/Web?Query=%27contract%20california%27&amp;WebFileType=%27PDF%27&amp;$top=50&amp;$format=Json" user="*****" password="*****" doc:name="Bing"/>
    <json:json-to-object-transformer returnClass="java.util.Map" doc:name="JSON to Object"/>
    <expression-transformer expression="#[message.payload.d.results]" doc:name="Expression"/>
    <collection-splitter doc:name="Collection Splitter"/>
    <set-variable variableName="fileName" value="#[org.mule.util.StringUtils.substringAfter(message.payload.Url, 'http://').replace('/','.')]" />
    <http:rest-service-component serviceUrl="#[joinChar=message.payload.Url.contains('?')?'&amp;':'?' ; StringUtils.join(new String[]{message.payload.Url,(String)joinChar,'followRedirects=true'})]" httpMethod="GET">
        <http:error-filter>
            <expression-filter expression="#[Integer.valueOf(message.inboundProperties['http.status']) &gt;= 400]" />
        </http:error-filter>
    </http:rest-service-component>
    <file:outbound-endpoint responseTimeout="10000" doc:name="File" outputPattern="#[flowVars.fileName]" path="/home/user/Documents/output" mimeType="application/pdf"/>
</flow>