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OIC Rest API : 400 Bad Request Malformed

Hi Oracle Community,

I have develop a proxy api for an external api that accepts payload with “[” and “]” . However in OIC, I encountered the error of 400 malformed payload. See below.

[XA02][ASIA-186][0]

{ 
"message": "Bad Request", 
"_links": { 
"self": { 
"href": "/", 
"templated": false 
} 
}, 
"_embedded": { 
"errors": [ 
{ 
"message": "Malformed URI: Illegal character in path at index 82: /ic/api/integration/v1/flows/rest/UNIT4GENERICAPI_1780999458/1.0/attribute-values/[XA02][ASIA-186][0]" 
} 
] 
}

Also, i tried sending also as encoded %5BXA02%5D%5BASIA-186%5D%5B0%5D but got the same error.

Anyone experience this kind of error?

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Added on Jun 10 2026
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