The reason-level solution to the HTTP request in SpringBoot

HTTP requests in Spring Boot applications may be caused by a variety of reasons. The following are some common problems and solutions:

1. Port conflict

• question: The application port is occupied.

• solve: Check port occupancy and modifyorPort configuration in  .

=8081

2. Web service not started

• question: Web dependencies are not introduced correctly or Web features are not enabled.

• solve:make sureorSpring web dependencies are included.

<dependency>
    <groupId></groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

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3. Request path error

• question: The request path does not match the controller mapping.

• solve: Check the controller annotation and request path.

@RestController
public class MyController {
    @GetMapping("/hello")
    public String hello() {
        return "Hello World";
    }
}

4. Firewall or network problems

• question: Firewall or network settings block requests.

• solve: Check the firewall rules to ensure the port is open, and troubleshoot network problems.

5. The application is not started

• question: The application did not start successfully.

• solve: Check the logs to ensure that the application starts without exceptions.

6. Cross-domain issues

• question: Front-end requests are blocked due to cross-domain.

• solve: Configure cross-domain support.

@Configuration
public class CorsConfig implements WebMvcConfigurer {
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        ("/**")
                .allowedOrigins("*")
                .allowedMethods("GET", "POST", "PUT", "DELETE");
    }
}

7. SSL configuration issues

• question: HTTPS configuration error.

• solve: Check the SSL configuration to ensure that the certificate is valid.

=8443
-store=classpath:
-store-password=your_password
-password=your_password

8. The request method mismatch

• question: The request method does not match the controller method.

• solve: Ensure that the request method (GET, POST, etc.) is consistent with the controller method.

@PostMapping("/submit")
public String submit(@RequestBody MyData data) {
    return "Data received";
}

9. Request parameter issues

• question: The request parameter is missing or the format is incorrect.

• solve: Check the request parameters to ensure compliance with the requirements.

@GetMapping("/user")
public String getUser(@RequestParam String id) {
    return "User ID: " + id;
}

10. Filter or interceptor issues

• question: Filter or interceptor blocks requests.

• solve: Check the relevant code to ensure the logic is correct.

@Component
public class MyFilter implements Filter {
    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        // Logical processing        (request, response);
    }
}

11. The log level is too high

• question: The log level is set too high, and important information is ignored.

• solve: Adjust the log level and view detailed logs.

=DEBUG

12. Dependency conflict

• question: Dependency conflict causes functional abnormalities.

• solve:usemvn dependency:treeCheck dependencies and eliminate conflicts.

<dependency>
    <groupId></groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <exclusions>
        <exclusion>
            <groupId></groupId>
            <artifactId>jackson-databind</artifactId>
        </exclusion>
    </exclusions>
</dependency>

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Summarize

By checking the above steps one by one, the problem of HTTP request failure can usually be solved. If the problem is still not resolved, it is recommended to view the log or use the debugging tool to analyze it further.

This is the article about the reason why HTTP requests are not accessible in SpringBoot. This is all about this article. For more related contents of SpringBoot HTTP requests, please search for my previous articles or continue browsing the related articles below. I hope everyone will support me in the future!