RESTful APIs are arguably the most popular endpoints for accessing Web services. Blackbox testing is one of the emerging techniques for ensuring the reliability of RESTful APIs. The major challenge in testing RESTful APIs is the need for correct sequences of API operation calls for in-depth testing. To build meaningful operation call sequences, researchers have proposed techniques to learn and utilize the API dependencies based on OpenAPI specifications. However, these techniques either lack the overall awareness of how all the APIs are connected or the flexibility of adaptively fixing the learned knowledge.

Many big companies are providing cloud services through RESTful APIs nowadays. With the growing popularity of RESTful API, testing RESTful API becomes crucial. To address this issue, researchers have proposed several automatic RESTful API testing techniques. At Huawei, we design and implement an automatic RESTful API testing framework named Morest. Morest has been used to test ten RESTful API services and helped to detected 83 previously unknown bugs which were all confirmed and fixed by the developers. On one hand, we find that Morest shows great capability of detecting bugs in RESTful API s. On the other hand, we also notice that human effort is inevitable and important when applying automatic RESTful API techniques in practice.