> +
> + public AWSRequestSignerV4(String identity, String credential, Crypto
> crypto) {
> + this.crypto = checkNotNull(crypto);
> + this.identity = checkNotNull(identity);
> + this.credential = checkNotNull(credential);
> + }
> +
> + private String buildHashedCanonicalRequest(String method, String
> endpoint, String hashedPayload,
> + String canonicalizedHeadersString, String signedHeaders) {
> + StringBuilder buffer = new StringBuilder();
> + buffer.append(method).append("\n");
> + buffer.append(endpoint).append("\n");
> + buffer.append("").append("\n");
> + buffer.append(canonicalizedHeadersString).append("\n");
> + buffer.append(signedHeaders).append("\n");
> + buffer.append(hashedPayload);
You can write this in a more compact form by reusing the return value of
```StringBuffer``` methods, e.g.,
```
String string = new StringBuffer()
.append(method).append("\n")
.append(endpoint).append("\n")
...
.build()
```
And actually this is equivalent to just using + for concatenation.
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