Merge bitcoin/bitcoin#30215: doc: JSON-RPC request Content-Type is application/json

3c08e11 doc: JSON-RPC request Content-Type is application/json (Luke Dashjr)

Pull request description:

  Specify json content type in RPC examples.

  Picks up #29946. Which needed rebasing and the commit message fixing,

ACKs for top commit:
  laanwj:
    ACK 3c08e11
  tdb3:
    ACK for 3c08e11

Tree-SHA512: 770bbbc0fb324cb63628980b13583cabf02e75079851850170587fb6eca41a70b01dcedaf1926bb6488eb9816a3cc6616fe8cee8c4b7e09aa39b7df5834ca0ec

Author: fanquake

doc/JSON-RPC-interface.md

@@ -33,10 +33,10 @@ requests when multiple wallets are in use.
 
 ```sh
 # Get block count from the / endpoint when rpcuser=alice and rpcport=38332
-$ curl --user alice --data-binary '{"jsonrpc": "1.0", "id": "0", "method": "getblockcount", "params": []}' -H 'content-type: text/plain;' localhost:38332/
+$ curl --user alice --data-binary '{"jsonrpc": "1.0", "id": "0", "method": "getblockcount", "params": []}' -H 'content-type: application/json;' localhost:38332/
 
 # Get balance from the /wallet/walletname endpoint when rpcuser=alice, rpcport=38332 and rpcwallet=desc-wallet
-$ curl --user alice --data-binary '{"jsonrpc": "1.0", "id": "0", "method": "getbalance", "params": []}' -H 'content-type: text/plain;' localhost:38332/wallet/desc-wallet
+$ curl --user alice --data-binary '{"jsonrpc": "1.0", "id": "0", "method": "getbalance", "params": []}' -H 'content-type: application/json;' localhost:38332/wallet/desc-wallet
 
 ```
 

src/rpc/util.cpp

@@ -176,7 +176,7 @@ std::string HelpExampleCliNamed(const std::string& methodname, const RPCArgList&
 std::string HelpExampleRpc(const std::string& methodname, const std::string& args)
 {
     return "> curl --user myusername --data-binary '{\"jsonrpc\": \"2.0\", \"id\": \"curltest\", "
-        "\"method\": \"" + methodname + "\", \"params\": [" + args + "]}' -H 'content-type: text/plain;' http://127.0.0.1:8332/\n";
+        "\"method\": \"" + methodname + "\", \"params\": [" + args + "]}' -H 'content-type: application/json;' http://127.0.0.1:8332/\n";
 }
 
 std::string HelpExampleRpcNamed(const std::string& methodname, const RPCArgList& args)
@@ -187,7 +187,7 @@ std::string HelpExampleRpcNamed(const std::string& methodname, const RPCArgList&
     }
 
     return "> curl --user myusername --data-binary '{\"jsonrpc\": \"2.0\", \"id\": \"curltest\", "
-           "\"method\": \"" + methodname + "\", \"params\": " + params.write() + "}' -H 'content-type: text/plain;' http://127.0.0.1:8332/\n";
+           "\"method\": \"" + methodname + "\", \"params\": " + params.write() + "}' -H 'content-type: application/json;' http://127.0.0.1:8332/\n";
 }
 
 // Converts a hex string to a public key if possible

src/test/rpc_tests.cpp

@@ -552,7 +552,7 @@ BOOST_AUTO_TEST_CASE(help_example)
     // test different argument types
     const RPCArgList& args = {{"foo", "bar"}, {"b", true}, {"n", 1}};
     BOOST_CHECK_EQUAL(HelpExampleCliNamed("test", args), "> bitcoin-cli -named test foo=bar b=true n=1\n");
-    BOOST_CHECK_EQUAL(HelpExampleRpcNamed("test", args), "> curl --user myusername --data-binary '{\"jsonrpc\": \"2.0\", \"id\": \"curltest\", \"method\": \"test\", \"params\": {\"foo\":\"bar\",\"b\":true,\"n\":1}}' -H 'content-type: text/plain;' http://127.0.0.1:8332/\n");
+    BOOST_CHECK_EQUAL(HelpExampleRpcNamed("test", args), "> curl --user myusername --data-binary '{\"jsonrpc\": \"2.0\", \"id\": \"curltest\", \"method\": \"test\", \"params\": {\"foo\":\"bar\",\"b\":true,\"n\":1}}' -H 'content-type: application/json;' http://127.0.0.1:8332/\n");
 
     // test shell escape
     BOOST_CHECK_EQUAL(HelpExampleCliNamed("test", {{"foo", "b'ar"}}), "> bitcoin-cli -named test foo='b'''ar'\n");
@@ -565,15 +565,15 @@ BOOST_AUTO_TEST_CASE(help_example)
     obj_value.pushKV("b", false);
     obj_value.pushKV("n", 1);
     BOOST_CHECK_EQUAL(HelpExampleCliNamed("test", {{"name", obj_value}}), "> bitcoin-cli -named test name='{\"foo\":\"bar\",\"b\":false,\"n\":1}'\n");
-    BOOST_CHECK_EQUAL(HelpExampleRpcNamed("test", {{"name", obj_value}}), "> curl --user myusername --data-binary '{\"jsonrpc\": \"2.0\", \"id\": \"curltest\", \"method\": \"test\", \"params\": {\"name\":{\"foo\":\"bar\",\"b\":false,\"n\":1}}}' -H 'content-type: text/plain;' http://127.0.0.1:8332/\n");
+    BOOST_CHECK_EQUAL(HelpExampleRpcNamed("test", {{"name", obj_value}}), "> curl --user myusername --data-binary '{\"jsonrpc\": \"2.0\", \"id\": \"curltest\", \"method\": \"test\", \"params\": {\"name\":{\"foo\":\"bar\",\"b\":false,\"n\":1}}}' -H 'content-type: application/json;' http://127.0.0.1:8332/\n");
 
     // test array params
     UniValue arr_value(UniValue::VARR);
     arr_value.push_back("bar");
     arr_value.push_back(false);
     arr_value.push_back(1);
     BOOST_CHECK_EQUAL(HelpExampleCliNamed("test", {{"name", arr_value}}), "> bitcoin-cli -named test name='[\"bar\",false,1]'\n");
-    BOOST_CHECK_EQUAL(HelpExampleRpcNamed("test", {{"name", arr_value}}), "> curl --user myusername --data-binary '{\"jsonrpc\": \"2.0\", \"id\": \"curltest\", \"method\": \"test\", \"params\": {\"name\":[\"bar\",false,1]}}' -H 'content-type: text/plain;' http://127.0.0.1:8332/\n");
+    BOOST_CHECK_EQUAL(HelpExampleRpcNamed("test", {{"name", arr_value}}), "> curl --user myusername --data-binary '{\"jsonrpc\": \"2.0\", \"id\": \"curltest\", \"method\": \"test\", \"params\": {\"name\":[\"bar\",false,1]}}' -H 'content-type: application/json;' http://127.0.0.1:8332/\n");
 
     // test types don't matter for shell
     BOOST_CHECK_EQUAL(HelpExampleCliNamed("foo", {{"arg", true}}), HelpExampleCliNamed("foo", {{"arg", "true"}}));