Encoding URLs in APIs: Avoiding Broken Requests and 400 Errors
Improperly encoded URLs cause broken API calls. Learn when and how to encode URL segments vs query parameters, and how to debug 400 errors from bad encoding.
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Tags: encoding, api, url
Encoding URLs in APIs: Avoiding Broken Requests and 400 Errors A 400 Bad Request with no meaningful error message. A search that returns zero results when the database has matching records. A redirect that fails silently. URL encoding bugs in API calls have a way of being invisible until they surface in production. This post covers the specific patterns that cause these bugs and how to fix them. The Most Common Bug: Unencoded Values in Query Strings The in the value splits the query string. The server never sees the intended value. --- Path Segment Encoding Path segments need encoding too, but they have different rules: is the segment separator, so a within a segment value must be encoded as . Other characters that need encoding in path segments: --- : Manual Encoding Required does not…
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