After creating a JavaScript web application for processing documents, I am now looking to integrate with web services like NLTK-server, TIKA-server, and SOLR for further analysis. While I can successfully access the REST endpoints of these services using curl, transitioning to JavaScript/jQuery/Ajax has presented a challenge due to the same-origin (CORS) issue that many others have encountered.
It seems that setting up a reverse proxy is the solution, but understanding how to implement this has proven to be daunting based on the search results I've come across. As a developer rather than a sys admin, I believe there must be a simpler way to address this widespread problem of web apps accessing web services. My attempts to configure Jetty as a reverse proxy have not been successful, so I would greatly appreciate any guidance or a beginner's tutorial on using a proxy.
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In my development process within Netbeans (I understand it may be excessive, but it is what I am familiar with), utilizing the embedded GlassFish server means my execution takes places at localhost:8383. When running the "Services," such as starting the tika-server with:
java -jar tika-server
The server initiates on port 9998 (also locally hosted), allowing me to interact with documents via curl. However, when attempting to submit a document to Tika through Ajax, I encounter the CORS error. Although I managed to connect to the SOLR server by adjusting the AJAX request to include:
wt:'json'
This was only possible because Solr supports JSONP; however, this approach cannot be assumed for all other web services I plan to use. Currently, I rely on Tika for extracting text from various file formats, a task previously accomplished in Java by simply including the required jar files. Nevertheless, adapting to a web-based interface has proved more challenging than anticipated.