handle signed get

src/net.ts

@@ -25,32 +25,30 @@ export const signedFetch = async (url: string, init: RequestInit, signedInit: Si
         ["Content-Type", `application/ld+json; profile="${CONTEXT}"`]
     ];
 
+    const newHeaders = new Headers();
+
     if (signedInit.digest && init.body) {
         signedHeaders.push(["Digest", signedInit.digest]);
     }
-    else if (init.body) {
+    else if (init.method === "POST" && init.body) {
         if (Buffer.isBuffer(init.body) || typeof init.body === "string") {
             signedHeaders.push(["Digest", hashDigest(init.body)]);
         }
         else throw "unsupported body type";
+
+        const signer = new Sha256Signer({
+            privateKey: signedInit.privateKey,
+            publicKeyId: signedInit.keyId
+        });
+    
+        const signature = signer.sign({
+            url,
+            method: init.method as string,
+            headers: signedHeaders
+        });
+    
+        newHeaders.set("Signature", signature);
     }
-    else {
-        throw "no body provided";
-    }
-
-    const signer = new Sha256Signer({
-        privateKey: signedInit.privateKey,
-        publicKeyId: signedInit.keyId
-    });
-
-    const signature = signer.sign({
-        url,
-        method: init.method as string,
-        headers: signedHeaders
-    });
-
-    const newHeaders = new Headers();
-    newHeaders.set("Signature", signature);
 
     if (Array.isArray(init.headers) || !init.headers) {
         for (const header of (init.headers || [])) {