Resolving the 301 and 404 Error Responses in Odoo 15 API Calls

Encountering `301` and `404` HTTP errors in Odoo 15? Learn how to resolve these issues with your API endpoint effectively and ensure successful responses.
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This video is based on the question https://stackoverflow.com/q/73714926/ asked by the user 'Makka Prashant' ( https://stackoverflow.com/u/14808641/ ) and on the answer https://stackoverflow.com/a/73715101/ provided by the user 'Ahmed Salman' ( https://stackoverflow.com/u/17956956/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding HTTP Errors in Odoo 15 API Calls

When working with APIs in Odoo 15, you might run into frustrating HTTP errors such as 301 and 404. These can halt your progress and can be puzzling to troubleshoot. In this guide, we will explore the reasons behind these error responses and guide you on how to fix them effectively.

Problem Overview: The API Call Errors

In the provided scenario, you're attempting to call an API endpoint at /crm/lead using a POST request via Postman. However, you encounter the following error logs:

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What Do These Codes Mean?

301 (Moved Permanently): This status code indicates that the requested URI has been permanently moved to a new location. It's usually a result of a redirect in the API's routing structure.

404 (Not Found): This error indicates that the server couldn’t find the requested resource. It often happens if the URL is incorrect or the resource doesn’t exist.

Now, let's dig deeper into potential causes and how to resolve them.

Analyzing the Code

Here’s the code that you're working with:

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Key Areas to Look At

Endpoint Definition:

You have defined the endpoint with the route '/crm/lead' which is set to accept JSON requests.

Return Type:

The return statement in your endpoint is sending a string, but the endpoint is declared to return a JSON object (type='json'). This inconsistency leads to issues.

Redirection:

The 301 error may also indicate that you are trying to access /crm/lead/ (with a trailing slash) instead of /crm/lead. In many frameworks, a trailing slash means something different (it can indicate a directory).

Solution: Fixing the Code

To resolve the issues you are facing, here are the steps you should follow:

1. Modify the Endpoint Response Type

Change the return statement in your API call from a string to a JSON response. Here is the updated code:

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2. Avoid Trailing Slash in Calls

When you send requests through Postman, ensure that you do not include a trailing slash in your endpoint URL. Use:

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instead of:

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By following these guidelines, you should see an improvement in your API response and eliminate the 301 and 404 errors.

Conclusion

Working with APIs can occasionally lead to encountering various HTTP status codes. The key is to understand what they mean and how to troubleshoot them effectively. By correctly defining your return types and managing your endpoint URLs, you can resolve many of the common issues faced when developing in Odoo 15. If you have any further questions or need additional assistance, feel free to reach out!

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