Unexpected char 0x0a in header value when using OkHttp client in Android

java android base64 retrofit okhttp
priyankvex picture priyankvex · Mar 26, 2017 · Viewed 11.2k times · Source

When sending a Base64 encoded string as header using Http, I am getting error response as

Unexpected char 0x0a at 28 in header value: I99Uy+HjG5PpEhmi8vZgm0W7KDQ=

Usage :

String encodedHeader = Base64.encodeToString(value.getBytes(), Base64.DEFAULT); header.put("auth", encodedHeader);

Answer

priyankvex picture priyankvex · Mar 26, 2017

0x0a is a newline character which is forbidden in a header. Solution would be to make sure that these characters are stripped off before sending the encoded value as header.

Base64.encodeToString(credentials.getBytes(), Base64.NO_WRAP); this avoids wrapping with a platform specific newline character(s).

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