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accessing error response data with responsecontenttype blob in javascript (detailed tutorial)

when making api requests that might return error responses, properly handling and understanding the error data is crucial for a robust application. if your api responds with `content-type: application/octet-stream` (or specifically configured as `responsecontenttype.blob` in some http client libraries), accessing the error data requires special considerations. this tutorial will walk you through the process, covering different scenarios and providing practical code examples.

*understanding the challenge*

the core issue is that `responsecontenttype.blob` indicates the api is sending binary data. while this is perfect for images, documents, and other media, it can pose a challenge when the api intends to send error details in a text-based format (like json or plain text) but under the guise of a blob. you need to convert this binary representation back into a readable format to extract the error information.

*scenarios we'll cover*

1. *api returns json as a blob on error:* the server sends a json payload containing error details, but the `content-type` is set to `application/octet-stream` or handled as `responsecontenttype.blob`.
2. *api returns plain text as a blob on error:* the server sends a plain text error message in a binary blob format.
3. *handling different error codes and status codes:* ensuring that you correctly interpret the http status code and extract the error data based on that status.
4. *implementing a generic error handling function:* create a reusable function to streamline error processing.
5. *using different http client libraries (fetch api, axios):* demonstrate how to achieve the same results with different widely used http client libraries.
6. *dealing with large blobs:* addressing potential memory issues when working with potentially very large error blobs.

*prerequisites*

basic understanding of javascript (asyn ...

#AccessError #ResponseContentType #windows
Access error
response data
ResponseContentType
Blob
data retrieval
error handling
API response
content type
blob storage
access rights
data permissions
response format
error message
server response
binary data