Improve error messages for responses from committer

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - [2551](https://github.com/FuelLabs/fuel-core/pull/2551): Enhanced the DA compressed block header to include block id.
 
 ### Fixed
+- [2609](https://github.com/FuelLabs/fuel-core/pull/2609): Check response before trying to deserialize, return error instead
 - [2599](https://github.com/FuelLabs/fuel-core/pull/2599): Use the proper `url` apis to construct full url path in `BlockCommitterHttpApi` client
 
 ## [Version 0.41.0]

crates/services/gas_price_service/Cargo.toml

@@ -22,7 +22,7 @@ num_enum = { workspace = true }
 parking_lot = { workspace = true }
 reqwest = { workspace = true, features = ["json"] }
 serde = { workspace = true }
-serde_json = { workspace = true, optional = true }
+serde_json = { workspace = true }
 strum = { workspace = true, features = ["derive"] }
 strum_macros = { workspace = true }
 thiserror = { workspace = true }
@@ -39,4 +39,4 @@ mockito = { version = "1.6.1" }
 serde_json = { workspace = true }
 
 [features]
-test-helpers = ["dep:mockito", "dep:serde_json"]
+test-helpers = ["dep:mockito"]

crates/services/gas_price_service/src/v1/da_source_service/block_committer_costs.rs

@@ -134,7 +134,8 @@ impl BlockCommitterApi for BlockCommitterHttpApi {
             let path = format!("/v1/costs?variant=specific&value={l2_block_number}&limit={NUMBER_OF_BUNDLES}");
             let full_path = url.join(&path)?;
             let response = self.client.get(full_path).send().await?;
-            let parsed = response.json::<Vec<RawDaBlockCosts>>().await?;
+            let text = response.text().await?;
+            let parsed: Vec<RawDaBlockCosts> = serde_json::from_str(&text).map_err(|e| { anyhow::anyhow!("Failed to get costs from block committer: {e} for the response {text}") })?;
             Ok(parsed)
         } else {
             Ok(vec![])