Error handling is an essential aspect of building robust and reliable REST APIs. When working with REST APIs, you need to anticipate and handle various types of errors that can occur during the API interactions.

There are several techniques you can employ for error handling in REST APIs:

1. Catching specific errors: You can use try-catch blocks to catch specific errors that may occur in your code. By catching specific errors, you can handle them accordingly and provide appropriate error messages to the client.

2. Catching all errors: In addition to catching specific errors, you can also catch all errors using a catch-all block. This can be useful when you want to handle any unexpected errors that may occur during the API interactions.

3. Propagating errors: Another technique is to propagate errors to the calling function or to the client. This can be done by using return codes or exceptions to indicate the occurrence of an error. By propagating errors, you can inform the client about the specific error that occurred and let them handle it accordingly.

Here's an example of error handling logic in C++:

1#include <iostream>
2
3int main() {
4  // Error handling logic
5
6  // Catch specific errors
7  try {
8    // Code that may throw an error
9  } catch (std::exception& e) {
10    // Handle specific error type
11  }
12
13  // Catch all errors
14  try {
15    // Code that may throw an error
16  } catch (...) {
17    // Handle all errors
18  }
19
20  // Propagate errors
21  bool success = true;
22
23  if (!success) {
24    throw std::runtime_error("An error occurred");
25  }
26
27  return 0;
28}

By employing these error handling techniques, you can ensure that your REST API handles errors gracefully and provides meaningful feedback to the clients.

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#include <iostream>

​

int main() {

  // Error handling logic

​

  // Catch specific errors

  try {

    // Code that may throw an error

  } catch (std::exception& e) {

    // Handle specific error type

  }

​

  // Catch all errors

  try {

    // Code that may throw an error

  } catch (...) {

    // Handle all errors

  }

​

  // Propagate errors

  bool success = true;

​

  if (!success) {

    throw std::runtime_error("An error occurred");

  }

​

  return 0;

}