Split from_data() up in smaller pieces

To still be able to handle errors correctly, also regarding the http
status code, `thiserror::Error` is used.

Cargo.lock

@@ -1009,6 +1009,26 @@ dependencies = [
  "winapi-util",
 ]
 
+[[package]]
+name = "thiserror"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e0f4a65597094d4483ddaed134f409b2cb7c1beccf25201a9f73c719254fa98e"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7765189610d8241a44529806d6fd1f2e0a08734313a35d5b3a556f92b381f3c0"
+dependencies = [
+ "proc-macro2 1.0.26",
+ "quote 1.0.9",
+ "syn 1.0.68",
+]
+
 [[package]]
 name = "time"
 version = "0.1.43"
@@ -1169,6 +1189,7 @@ dependencies = [
  "serde_json",
  "serde_yaml",
  "sha2",
+ "thiserror",
 ]
 
 [[package]]