feat(driver): gRPC driver (v1.1.0)

CHANGELOG.md

@@ -13,12 +13,9 @@ under the affected version with a reference to the CVE or advisory.
 ## [Unreleased]
 
 ### Added
-- `sendit generate --url`: sitemap support — `Sitemap:` entries in `robots.txt` and `<a href="*sitemap*.xml">` links found during crawl are now parsed as sitemap XML sources, feeding discovered `<loc>` URLs into the crawl queue; handles both `<urlset>` and `<sitemapindex>` formats
-
-### Fixed
-- `sendit generate --url`: crawl now normalises URLs before deduplication — strips trailing slashes from non-root paths and removes fragments/query strings so that `https://example.com/page` and `https://example.com/page/` are no longer treated as separate targets
-- `sendit generate --url`: non-HTML file extensions (`.xml`, `.json`, `.pdf`, `.css`, `.js`, images, fonts, media, archives) are now excluded as crawl targets; only pages likely to be HTML are included
-- `sendit generate --url`: sitemap `<loc>` entries with a different scheme than the seed URL (e.g. `http://` locs in an `https://` site's sitemap) are normalised to the seed's scheme, preventing scheme-variant duplicates
+- `type: grpc` driver — executes unary gRPC calls using server reflection; no `.proto` files required. URL format: `grpc://host:port/Service/Method` (plaintext) or `grpcs://` (TLS). JSON body is unmarshalled to protobuf via reflection. gRPC status codes are mapped to HTTP-like codes so the engine's error classifier and backoff work uniformly. Connections and method descriptors are cached per address.
+- `grpc` block in `TargetConfig` and `TargetDefaultsConfig` with fields: `body`, `timeout_s`, `tls`, `insecure`
+- gRPC driver documented in Drivers, Configuration, and Dependencies docs pages
 
 ---
 

docs/content/docs/_index.md

@@ -51,7 +51,7 @@ Press Ctrl-C to stop and print a summary. See the [CLI Reference](cli/) for all
 | [Getting Started](getting-started/) | Install, build, validate a config, run your first traffic, and deploy with Docker |
 | [Configuration](configuration/) | Every config key, its type, default, and description |
 | [Pacing Modes](pacing/) | `human`, `rate_limited`, `scheduled`, and `burst` — how request timing works |
-| [Drivers](drivers/) | `http`, `browser`, `dns`, `websocket` — options and examples for each |
+| [Drivers](drivers/) | `http`, `browser`, `dns`, `websocket`, `grpc` — options and examples for each |
 | [Metrics](metrics/) | Prometheus metrics exposed by sendit and how to scrape them |
 | [CLI Reference](cli/) | All commands and flags |
 | [Dependencies](dependencies/) | Direct dependencies, their purpose, and their licences |

docs/content/docs/configuration.md

@@ -92,10 +92,11 @@ Load targets from a plain-text file instead of (or in addition to) the inline `t
 
 ```
 # config/targets.txt
-https://example.com      http   5
-https://api.example.com  http   3
-example.com              dns    2
-wss://ws.example.com     websocket
+https://example.com             http      5
+https://api.example.com         http      3
+example.com                     dns       2
+wss://ws.example.com            websocket
+grpc://svc.example.com:50051/helloworld.Greeter/SayHello   grpc   4
 ```
 
 `target_defaults` supplies remaining fields for every file-loaded target:
@@ -122,6 +123,7 @@ target_defaults:
 | `dns.resolver` | `8.8.8.8:53` | DNS resolver address |
 | `dns.record_type` | `A` | DNS record type |
 | `websocket.duration_s` | `30` | How long to hold the connection open (seconds) |
+| `grpc.timeout_s` | `15` | Per-call timeout (seconds) |
 
 ## `output`
 

docs/content/docs/dependencies.md

@@ -5,7 +5,7 @@ weight: 95
 description: "Direct dependencies, their purpose, and their licences."
 ---
 
-sendit has 14 direct runtime dependencies. All are permissive open-source licences
+sendit has 16 direct runtime dependencies. All are permissive open-source licences
 compatible with the project's [MIT licence](https://github.com/lewta/sendit/blob/main/LICENSE).
 
 The module graph is managed with `go mod tidy` and kept minimal — no dependency
@@ -28,6 +28,8 @@ appears that cannot be justified by the table below.
 | [`github.com/spf13/viper`](https://github.com/spf13/viper) | v1.21.0 | MIT | Config file loading with environment variable overlay and `mapstructure` unmarshalling |
 | [`golang.org/x/net`](https://pkg.go.dev/golang.org/x/net) | v0.52.0 | BSD-3-Clause | `html` subpackage — HTML parser used by the `generate` command to extract links |
 | [`golang.org/x/time`](https://pkg.go.dev/golang.org/x/time) | v0.15.0 | BSD-3-Clause | `rate` subpackage — token-bucket rate limiter used by `rate_limited` and `scheduled` pacing |
+| [`google.golang.org/grpc`](https://pkg.go.dev/google.golang.org/grpc) | v1.79.3 | Apache-2.0 | gRPC client and server — powers the `grpc` driver; includes reflection client and health service |
+| [`google.golang.org/genproto/googleapis/rpc`](https://pkg.go.dev/google.golang.org/genproto/googleapis/rpc) | v0.0.0-20251202 | Apache-2.0 | Generated gRPC status and error type definitions — transitive requirement of `google.golang.org/grpc` |
 | [`modernc.org/sqlite`](https://pkg.go.dev/modernc.org/sqlite) | v1.47.0 | BSD-3-Clause | Pure-Go SQLite driver (CGo-free) — used by `generate` to read Chrome/Firefox history and bookmark databases |
 
 ## Alternatives considered
@@ -50,7 +52,7 @@ All dependency licences are permissive and compatible with the project's MIT lic
 | MIT | `bubbletea`, `lipgloss`, `chromedp`, `cron/v3`, `zerolog`, `viper` |
 | ISC | `coder/websocket` |
 | BSD-3-Clause | `miekg/dns`, `gopsutil/v3`, `x/net`, `x/time`, `modernc.org/sqlite` |
-| Apache-2.0 | `prometheus/client_golang`, `cobra` |
+| Apache-2.0 | `prometheus/client_golang`, `cobra`, `google.golang.org/grpc`, `genproto/googleapis/rpc` |
 
 ISC, BSD-2-Clause, and BSD-3-Clause are functionally equivalent to MIT for distribution purposes.
 Apache-2.0 is compatible with MIT when distributing binaries (no copyleft restriction).

docs/content/docs/drivers.md

@@ -2,7 +2,7 @@
 title: "Drivers"
 linkTitle: "Drivers"
 weight: 4
-description: "HTTP, browser, DNS, and WebSocket driver options and examples."
+description: "HTTP, browser, DNS, WebSocket, and gRPC driver options and examples."
 ---
 
 A **driver** is responsible for executing a single request and returning a result. Each target in your config specifies a `type` that selects the driver. All drivers map their results to HTTP-like status codes so the engine's error classifier, backoff, and metrics work uniformly.
@@ -136,3 +136,68 @@ targets:
 - url: "wss://stream.example.com:9443/feed"
   type: websocket
 ```
+
+## `grpc`
+
+Executes a **unary gRPC call** using [google.golang.org/grpc](https://pkg.go.dev/google.golang.org/grpc). No `.proto` files are required — the driver uses [server reflection](https://grpc.io/docs/guides/reflection/) to discover request and response types at runtime, then marshals the JSON body to protobuf automatically.
+
+```yaml
+targets:
+  - url: grpc://localhost:50051/helloworld.Greeter/SayHello
+    weight: 10
+    type: grpc
+    grpc:
+      body: '{"name": "world"}'   # JSON-encoded request (optional — defaults to empty message)
+      timeout_s: 15               # per-call timeout in seconds
+      tls: false                  # force TLS even when scheme is grpc://
+      insecure: false             # skip TLS certificate verification
+```
+
+| Field | Default | Description |
+|---|---|---|
+| `body` | `""` | JSON-encoded request body. Must match the method's input proto type. Empty sends a default-constructed message. |
+| `timeout_s` | `15` | Per-call timeout in seconds |
+| `tls` | `false` | Force TLS even when the URL scheme is `grpc://` |
+| `insecure` | `false` | Skip TLS certificate verification (combine with `tls: true` or `grpcs://` scheme) |
+
+**URL scheme** selects transport security:
+
+| Scheme | Transport |
+|---|---|
+| `grpc://host:port/Service/Method` | Plaintext |
+| `grpcs://host:port/Service/Method` | TLS |
+
+**gRPC status codes** are mapped to HTTP-like status codes so the engine's backoff and error classifier work uniformly:
+
+| gRPC code | HTTP equivalent | Effect |
+|---|---|---|
+| OK (0) | 200 | success |
+| InvalidArgument (3), OutOfRange (11) | 400 | permanent skip |
+| Unauthenticated (16) | 401 | permanent skip |
+| PermissionDenied (7) | 403 | permanent skip |
+| NotFound (5) | 404 | permanent skip |
+| AlreadyExists (6) | 409 | permanent skip |
+| ResourceExhausted (8) | 429 | transient backoff |
+| Unimplemented (12) | 501 | permanent skip |
+| Unavailable (14) | 503 | transient backoff |
+| DeadlineExceeded (4) | 504 | transient backoff |
+| other | 500 | transient backoff |
+
+**Prerequisite:** the gRPC server must have the [server reflection service](https://grpc.io/docs/guides/reflection/) enabled. Most frameworks enable it via a single line (e.g. `reflection.Register(s)` in Go). If reflection is not available, the driver returns an error immediately.
+
+**Connection and descriptor caching:** connections and method descriptors are cached per address+TLS mode. Reflection is called only on the first request to each method; subsequent calls reuse the cached descriptor.
+
+```yaml
+# Multiple gRPC targets on the same server — connection is shared
+targets:
+  - url: grpc://api.example.com:50051/user.UserService/GetUser
+    type: grpc
+    weight: 8
+    grpc:
+      body: '{"user_id": "u-123"}'
+  - url: grpc://api.example.com:50051/user.UserService/ListUsers
+    type: grpc
+    weight: 2
+    grpc:
+      body: '{}'
+```

go.mod

@@ -16,6 +16,8 @@ require (
 	github.com/spf13/viper v1.21.0
 	golang.org/x/net v0.52.0
 	golang.org/x/time v0.15.0
+	google.golang.org/grpc v1.79.3
+	google.golang.org/protobuf v1.36.10
 	howett.net/plist v1.0.1
 	modernc.org/sqlite v1.47.0
 )
@@ -77,7 +79,7 @@ require (
 	golang.org/x/sys v0.42.0 // indirect
 	golang.org/x/text v0.35.0 // indirect
 	golang.org/x/tools v0.42.0 // indirect
-	google.golang.org/protobuf v1.36.8 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20251202230838-ff82c1b0f217 // indirect
 	modernc.org/libc v1.70.0 // indirect
 	modernc.org/mathutil v1.7.1 // indirect
 	modernc.org/memory v1.11.0 // indirect

go.sum

@@ -38,6 +38,10 @@ github.com/fsnotify/fsnotify v1.9.0 h1:2Ml+OJNzbYCTzsxtv8vKSFD9PbJjmhYF14k/jKC7S
 github.com/fsnotify/fsnotify v1.9.0/go.mod h1:8jBTzvmWwFyi3Pb8djgCCO5IBqzKJ/Jwo8TRcHyHii0=
 github.com/go-json-experiment/json v0.0.0-20260214004413-d219187c3433 h1:vymEbVwYFP/L05h5TKQxvkXoKxNvTpjxYKdF1Nlwuao=
 github.com/go-json-experiment/json v0.0.0-20260214004413-d219187c3433/go.mod h1:tphK2c80bpPhMOI4v6bIc2xWywPfbqi1Z06+RcrMkDg=
+github.com/go-logr/logr v1.4.3 h1:CjnDlHq8ikf6E492q6eKboGOC0T8CDaOvkHCIg8idEI=
+github.com/go-logr/logr v1.4.3/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
+github.com/go-logr/stdr v1.2.2 h1:hSWxHoqTgW2S2qGc0LTAI563KZ5YKYRhT3MFKZMbjag=
+github.com/go-logr/stdr v1.2.2/go.mod h1:mMo/vtBO5dYbehREoey6XUKy/eSumjCCveDpRre4VKE=
 github.com/go-ole/go-ole v1.2.6 h1:/Fpf6oFPoeFik9ty7siob0G6Ke8QvQEuVcuChpwXzpY=
 github.com/go-ole/go-ole v1.2.6/go.mod h1:pprOEPIfldk/42T2oK7lQ4v4JSDwmV0As9GaiUsvbm0=
 github.com/go-viper/mapstructure/v2 v2.4.0 h1:EBsztssimR/CONLSZZ04E8qAkxNYq4Qp9LvH92wZUgs=
@@ -49,6 +53,8 @@ github.com/gobwas/pool v0.2.1/go.mod h1:q8bcK0KcYlCgd9e7WYLm9LpyS+YeLd8JVDW6Wezm
 github.com/gobwas/ws v1.4.0 h1:CTaoG1tojrh4ucGPcoJFiAQUAsEWekEWvLy7GsVNqGs=
 github.com/gobwas/ws v1.4.0/go.mod h1:G3gNqMNtPppf5XUz7O4shetPpcZ1VJ7zt18dlUeakrc=
 github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
+github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
+github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
 github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
 github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
@@ -160,6 +166,18 @@ github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e h1:JVG44RsyaB9T2KIHavM
 github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e/go.mod h1:RbqR21r5mrJuqunuUZ/Dhy/avygyECGrLceyNeo4LiM=
 github.com/yusufpapurcu/wmi v1.2.4 h1:zFUKzehAFReQwLys1b/iSMl+JQGSCSjtVqQn9bBrPo0=
 github.com/yusufpapurcu/wmi v1.2.4/go.mod h1:SBZ9tNy3G9/m5Oi98Zks0QjeHVDvuK0qfxQmPyzfmi0=
+go.opentelemetry.io/auto/sdk v1.2.1 h1:jXsnJ4Lmnqd11kwkBV2LgLoFMZKizbCi5fNZ/ipaZ64=
+go.opentelemetry.io/auto/sdk v1.2.1/go.mod h1:KRTj+aOaElaLi+wW1kO/DZRXwkF4C5xPbEe3ZiIhN7Y=
+go.opentelemetry.io/otel v1.39.0 h1:8yPrr/S0ND9QEfTfdP9V+SiwT4E0G7Y5MO7p85nis48=
+go.opentelemetry.io/otel v1.39.0/go.mod h1:kLlFTywNWrFyEdH0oj2xK0bFYZtHRYUdv1NklR/tgc8=
+go.opentelemetry.io/otel/metric v1.39.0 h1:d1UzonvEZriVfpNKEVmHXbdf909uGTOQjA0HF0Ls5Q0=
+go.opentelemetry.io/otel/metric v1.39.0/go.mod h1:jrZSWL33sD7bBxg1xjrqyDjnuzTUB0x1nBERXd7Ftcs=
+go.opentelemetry.io/otel/sdk v1.39.0 h1:nMLYcjVsvdui1B/4FRkwjzoRVsMK8uL/cj0OyhKzt18=
+go.opentelemetry.io/otel/sdk v1.39.0/go.mod h1:vDojkC4/jsTJsE+kh+LXYQlbL8CgrEcwmt1ENZszdJE=
+go.opentelemetry.io/otel/sdk/metric v1.39.0 h1:cXMVVFVgsIf2YL6QkRF4Urbr/aMInf+2WKg+sEJTtB8=
+go.opentelemetry.io/otel/sdk/metric v1.39.0/go.mod h1:xq9HEVH7qeX69/JnwEfp6fVq5wosJsY1mt4lLfYdVew=
+go.opentelemetry.io/otel/trace v1.39.0 h1:2d2vfpEDmCJ5zVYz7ijaJdOF59xLomrvj7bjt6/qCJI=
+go.opentelemetry.io/otel/trace v1.39.0/go.mod h1:88w4/PnZSazkGzz/w84VHpQafiU4EtqqlVdxWy+rNOA=
 go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
 go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
 go.yaml.in/yaml/v2 v2.4.2 h1:DzmwEr2rDGHl7lsFgAHxmNz/1NlQ7xLIrlN2h5d1eGI=
@@ -191,8 +209,14 @@ golang.org/x/time v0.15.0/go.mod h1:Y4YMaQmXwGQZoFaVFk4YpCt4FLQMYKZe9oeV/f4MSno=
 golang.org/x/tools v0.42.0 h1:uNgphsn75Tdz5Ji2q36v/nsFSfR/9BRFvqhGBaJGd5k=
 golang.org/x/tools v0.42.0/go.mod h1:Ma6lCIwGZvHK6XtgbswSoWroEkhugApmsXyrUmBhfr0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-google.golang.org/protobuf v1.36.8 h1:xHScyCOEuuwZEc6UtSOvPbAT4zRh0xcNRYekJwfqyMc=
-google.golang.org/protobuf v1.36.8/go.mod h1:fuxRtAxBytpl4zzqUh6/eyUujkJdNiuEkXntxiD/uRU=
+gonum.org/v1/gonum v0.16.0 h1:5+ul4Swaf3ESvrOnidPp4GZbzf0mxVQpDCYUQE7OJfk=
+gonum.org/v1/gonum v0.16.0/go.mod h1:fef3am4MQ93R2HHpKnLk4/Tbh/s0+wqD5nfa6Pnwy4E=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20251202230838-ff82c1b0f217 h1:gRkg/vSppuSQoDjxyiGfN4Upv/h/DQmIR10ZU8dh4Ww=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20251202230838-ff82c1b0f217/go.mod h1:7i2o+ce6H/6BluujYR+kqX3GKH+dChPTQU19wjRPiGk=
+google.golang.org/grpc v1.79.3 h1:sybAEdRIEtvcD68Gx7dmnwjZKlyfuc61Dyo9pGXXkKE=
+google.golang.org/grpc v1.79.3/go.mod h1:KmT0Kjez+0dde/v2j9vzwoAScgEPx/Bw1CYChhHLrHQ=
+google.golang.org/protobuf v1.36.10 h1:AYd7cD/uASjIL6Q9LiTjz8JLcrh/88q5UObnmY3aOOE=
+google.golang.org/protobuf v1.36.10/go.mod h1:HTf+CrKn2C3g5S8VImy6tdcUvCska2kB7j23XfzDpco=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=

internal/config/config.go

@@ -100,7 +100,7 @@ func loadTargetsFile(cfg *Config) error {
 	defer f.Close()
 
 	d := cfg.TargetDefaults
-	validTypes := map[string]bool{"http": true, "browser": true, "dns": true, "websocket": true}
+	validTypes := map[string]bool{"http": true, "browser": true, "dns": true, "websocket": true, "grpc": true}
 
 	scanner := bufio.NewScanner(f)
 	lineNum := 0
@@ -120,7 +120,7 @@ func loadTargetsFile(cfg *Config) error {
 		typ := strings.ToLower(fields[1])
 
 		if !validTypes[typ] {
-			return fmt.Errorf("line %d: unknown type %q (must be http|browser|dns|websocket)", lineNum, typ)
+			return fmt.Errorf("line %d: unknown type %q (must be http|browser|dns|websocket|grpc)", lineNum, typ)
 		}
 
 		weight := d.Weight
@@ -143,6 +143,7 @@ func loadTargetsFile(cfg *Config) error {
 			Browser:   d.Browser,
 			DNS:       d.DNS,
 			WebSocket: d.WebSocket,
+			GRPC:      d.GRPC,
 		})
 	}
 
@@ -221,7 +222,7 @@ func validate(cfg *Config) error {
 		errs = append(errs, "targets must have at least one entry (via 'targets' in config or 'targets_file')")
 	}
 
-	validTypes := map[string]bool{"http": true, "browser": true, "dns": true, "websocket": true}
+	validTypes := map[string]bool{"http": true, "browser": true, "dns": true, "websocket": true, "grpc": true}
 	for i, t := range cfg.Targets {
 		if t.URL == "" {
 			errs = append(errs, fmt.Sprintf("targets[%d].url must not be empty", i))
@@ -230,7 +231,10 @@ func validate(cfg *Config) error {
 			errs = append(errs, fmt.Sprintf("targets[%d].weight must be > 0", i))
 		}
 		if !validTypes[t.Type] {
-			errs = append(errs, fmt.Sprintf("targets[%d].type must be one of http|browser|dns|websocket, got %q", i, t.Type))
+			errs = append(errs, fmt.Sprintf("targets[%d].type must be one of http|browser|dns|websocket|grpc, got %q", i, t.Type))
+		}
+		if t.Type == "grpc" && !strings.HasPrefix(t.URL, "grpc://") && !strings.HasPrefix(t.URL, "grpcs://") {
+			errs = append(errs, fmt.Sprintf("targets[%d].url must start with grpc:// or grpcs:// for type grpc, got %q", i, t.URL))
 		}
 	}
 

internal/config/schema.go

@@ -23,6 +23,7 @@ type TargetDefaultsConfig struct {
 	Browser   BrowserConfig   `mapstructure:"browser"`
 	DNS       DNSConfig       `mapstructure:"dns"`
 	WebSocket WebSocketConfig `mapstructure:"websocket"`
+	GRPC      GRPCConfig      `mapstructure:"grpc"`
 }
 
 // PacingConfig controls how requests are spaced in time.
@@ -78,11 +79,12 @@ type BackoffConfig struct {
 type TargetConfig struct {
 	URL       string          `mapstructure:"url"`
 	Weight    int             `mapstructure:"weight"`
-	Type      string          `mapstructure:"type"` // http | browser | dns | websocket
+	Type      string          `mapstructure:"type"` // http | browser | dns | websocket | grpc
 	HTTP      HTTPConfig      `mapstructure:"http"`
 	Browser   BrowserConfig   `mapstructure:"browser"`
 	DNS       DNSConfig       `mapstructure:"dns"`
 	WebSocket WebSocketConfig `mapstructure:"websocket"`
+	GRPC      GRPCConfig      `mapstructure:"grpc"`
 }
 
 // HTTPConfig holds HTTP-specific target settings.
@@ -113,6 +115,16 @@ type WebSocketConfig struct {
 	ExpectMessages int      `mapstructure:"expect_messages"`
 }
 
+// GRPCConfig holds gRPC target settings.
+// The URL scheme selects TLS: grpc:// for plaintext, grpcs:// for TLS.
+// The cfg.TLS field can also force TLS regardless of scheme.
+type GRPCConfig struct {
+	Body     string `mapstructure:"body"`      // JSON-encoded request body (unmarshalled via reflection)
+	TimeoutS int    `mapstructure:"timeout_s"` // per-call timeout in seconds (default 15)
+	TLS      bool   `mapstructure:"tls"`       // force TLS even when scheme is grpc://
+	Insecure bool   `mapstructure:"insecure"`  // skip TLS certificate verification
+}
+
 // OutputConfig controls writing request results to a file.
 type OutputConfig struct {
 	Enabled  bool   `mapstructure:"enabled"`